Ichthyosis–Follicular Atrophoderma–Hypotrichosis–Hypohidrosis Syndrome (IFAHH)

Ichthyosis–Follicular Atrophoderma–Hypotrichosis–Hypohidrosis Syndrome (IFAHH) is a very rare, inherited skin and hair disorder. Babies are usually born with dry, scaly skin (ichthyosis). Over time, tiny ice-pick–like pits on the skin around hair follicles (follicular atrophoderma) appear, mostly on the backs of the hands or cheeks. Hair on the scalp, eyebrows, and eyelashes is thin or sparse (hypotrichosis). Many people sweat less than normal (hypohidrosis), so they can overheat easily. Doctors consider it part of the broad family of ectodermal dysplasias, conditions that affect skin, hair, nails, teeth, and sweat glands. In some families, the condition clusters across generations, suggesting a genetic cause. In medical literature, closely related syndromes link the features of ichthyosis, follicular atrophoderma, and hypotrichosis; some reports also include reduced sweating. PubMed+1

This syndrome is a genetic skin and hair condition present from birth. The top skin layer (the barrier) does not form or shed normally. Because of this, the skin is dry and scaly (ichthyosis). The tiny openings where hairs grow can collapse and look pitted (follicular atrophoderma). Hair is sparse or thin (hypotrichosis). Sweat glands may also work poorly, so some people do not sweat well (hypohidrosis) and can overheat. The most consistent cause is a harmful change in the ST14 gene, which makes an enzyme called matriptase that helps build a strong skin barrier; when this enzyme is weak or missing, the barrier breaks down and scale builds up. Doctors first described families with this exact four-part picture, and later studies tied it to ST14 and to problems processing profilaggrin/filaggrin, a key barrier protein. There is no cure yet; care focuses on restoring moisture, reducing scale, protecting from heat, and preventing infections. PMC+3PubMed+3PubMed+3

• Families have been reported with congenital ichthyosis + follicular atrophoderma + hypotrichosis; in one series, hypohidrosis was also present, matching the name used here. PubMed+1

• Mutations in ST14 (matriptase) can cause a closely related “ichthyosis–hypotrichosis” phenotype and impair normal processing of skin proteins such as profilaggrin, which helps the skin barrier work. These findings explain the dry skin and hair problems and are often used by doctors to guide genetic testing for this clinical picture. PubMed+2Orpha.net+2

• Follicular atrophoderma also occurs in Bazex–Dupré–Christol syndrome and some other ectodermal dysplasias, so doctors rule out these look-alikes during diagnosis. DermNet®+2ScienceDirect+2

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Other names

Because this is rare, clinicians may use slightly different labels describing the same or very similar findings:

• Ichthyosis with follicular atrophoderma and hypotrichosis (IFA) – with or without hypohidrosis. PubMed+1

• Ichthyosis–hypotrichosis syndrome (IHS) – a genetically related entity caused by ST14 variants that can include follicular atrophoderma and sometimes reduced sweating. Orpha.net+1

• Ectodermal dysplasia with ichthyosis and hypotrichosis – descriptive umbrella term used in clinics. Cleveland Clinic+1

Note: Bazex–Dupré–Christol syndrome also presents with follicular atrophoderma, hypotrichosis, and hypohidrosis, but it typically adds multiple basal cell carcinomas in adolescence/adulthood and follows X-linked inheritance. It is a key differential diagnosis, not the same disorder. DermNet®+2PubMed+2

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Types

Because only a small number of families have been reported, “types” are practical clinical groupings rather than fixed subtypes:

1. Classic IFAHH pattern – ichthyosis from birth, follicular atrophoderma in childhood, hypotrichosis, plus obvious heat intolerance due to hypohidrosis. PubMed

2. IFA pattern without clear hypohidrosis – same skin and hair findings, but sweating may be near normal or variable. OUP Academic+1

3. ST14-related ichthyosis–hypotrichosis spectrum – genetic confirmation of an ST14 variant; often includes ichthyosis and hair anomalies with possible follicular atrophoderma/hypohidrosis. PubMed+2Orpha.net+2

4. Overlapping ectodermal dysplasia phenotypes – features overlap with hypohidrotic ectodermal dysplasia (HED) or Bazex–Dupré–Christol, requiring careful evaluation to separate them. National Organization for Rare Disorders+2PMC+2

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Causes

Primary, disease-driving causes

1. Inherited gene changes affecting skin barrier enzymes (notably ST14/matriptase). Matriptase activates proteins important for forming a tight, flexible outer skin layer. When it fails, profilaggrin/filaggrin processing is impaired and the skin becomes dry and scaly. Hair formation also suffers. PubMed

2. Abnormal development of sweat glands (ectodermal dysplasia). If sweat glands are fewer or under-developed, sweating is reduced; the body overheats more easily. Cleveland Clinic+1

3. Hair follicle miniaturization or structural defects. Faulty signaling in follicles leads to thin, sparse hair that breaks easily. Orpha.net

4. Defective corneodesmosome breakdown. These “rivets” between skin cells must loosen for normal shedding; if not, scale builds up and pores look plugged, contributing to follicular atrophoderma. PubMed

5. Abnormal keratinization (cornification). The program by which skin cells mature is off-track, producing rough, plate-like scales and clogged follicular openings. ScienceDirect

Genetic and biologic modifiers (influence severity rather than create the disorder)

6. Other cornification-pathway genes (e.g., filaggrin pathway). Variants here can worsen dryness and barrier leaks. PubMed

7. Genes controlling ectodermal organs (EDA pathway). While classic HED uses different genes (EDA/EDAR/EDARADD), background variation in these pathways may tilt sweating capacity. MedlinePlus

8. Inflammation amplifiers. Secondary skin inflammation from micro-cracks boosts itch, redness, and scaling. ScienceDirect

9. Microbiome imbalance. Dry, fissured skin favors Staphylococcus and other microbes that aggravate scaling and follicle damage. (Inference consistent with ichthyosis literature.) ScienceDirect

10. Sun and wind exposure. Weather thickens scale and makes follicular pits more noticeable in exposed areas like the hands and cheeks. (Clinical inference from reported distributions.) PubMed

11. Heat exposure. Because sweating is poor, hot environments increase rashes, prickly heat, and dehydration risk. National Organization for Rare Disorders

12. Low humidity. Dry air worsens transepidermal water loss and scaling. (General barrier-defect principle, consistent with ichthyoses.) ScienceDirect

13. Harsh soaps/irritants. Detergents strip lipids and proteins from the already fragile barrier, flaring symptoms. (General dermatology principle.) ScienceDirect

14. Nutritional deficits (e.g., essential fatty acids). Poor skin-lipid building blocks can worsen dryness and breakage, though they are not the root genetic cause. (General ichthyosis care principle.) ScienceDirect

15. Frequent scratching. Mechanical trauma deepens follicular damage and increases infection risk. (General skin-barrier principle.) ScienceDirect

16. Secondary infections. Bacterial or fungal overgrowth inflames hair follicles and can mimic “folliculitis,” adding to hair loss and pits. (General ichthyosis care principle.) ScienceDirect

17. Allergic/atopic tendency. Some related cornification disorders show atopic dermatitis; itch and eczema can compound dryness and hair fragility. ScienceDirect

18. Hormonal changes (puberty, pregnancy). Shifts in oil and sweat production can modulate scaling and hair density. (Clinical inference across keratinization disorders.) ScienceDirect

19. Medications that dry the skin (e.g., some acne drugs). They can worsen scaling and brittleness. (General dermatology principle.) ScienceDirect

20. Psychological stress. Stress-induced scratching and sweat-gland dysregulation may worsen flares. (General dermatology principle.) ScienceDirect

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Symptoms and signs

1. Dry, plate-like scaling from infancy. Skin looks rough and may crack, especially on shins, trunk, or cheeks. Emollients help but the dryness returns quickly. PubMed+1

2. Follicular atrophoderma. Tiny funnel-shaped pits around follicles create a dotted, “ice-pick” look, often on the backs of the hands and cheeks. PubMed+1

3. Thin, sparse scalp hair (hypotrichosis). Hair may be fragile, slow-growing, or patchy. Eyebrows and eyelashes can be sparse. PubMed+1

4. Reduced sweating (hypohidrosis). People overheat in hot weather, during fevers, or with exercise. Infants may be irritable or flushed during warm seasons. PubMed+1

5. Heat intolerance. Headaches, flushing, and dizziness can occur because the body cannot cool itself well. National Organization for Rare Disorders

6. Itching and skin discomfort. Itch worsens in low humidity and improves with heavy moisturizers. ScienceDirect

7. Plugged follicles and rough patches. Keratin plugs make bumps that feel like sandpaper. ScienceDirect

8. Secondary skin infections. Cracks and scratching permit bacteria to enter, causing oozing or crusting that needs treatment. ScienceDirect

9. Nail changes (sometimes). Nails may be brittle or slow-growing in ectodermal dysplasia patterns. Cleveland Clinic

10. Eye irritation (occasionally). Dry skin on eyelids and sparse lashes can lead to grittiness or light sensitivity; true photophobia suggests other overlapping syndromes (e.g., IFAP). Orpha.net

11. Thickened palms/soles (sometimes). Some patients show mild palmoplantar thickening. Orpha.net

12. Facial skin pits and milia (small white cysts). These can appear in related conditions and may accompany follicular atrophoderma. PubMed

13. Cosmetic impact and psychosocial stress. Visible scaling and hair thinning can affect confidence and social comfort. (General impact across ichthyoses.) ScienceDirect

14. Dental or other ectodermal signs (variable). Most people with IFAHH do not have the full HED pattern, but minor findings can occur. National Organization for Rare Disorders

15. Normal growth and development otherwise. In reported families, stature and general development were normal. PubMed

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Diagnostic tests

A) Physical examination (bedside, non-device)

1. Full skin survey. The doctor maps where scaling and follicular pits occur, checks for fissures/infection, and looks for patterns typical of ichthyosis and follicular atrophoderma. PubMed

2. Hair and scalp inspection. Notes hair shaft caliber, density, breakage, and eyebrow/eyelash involvement. ScienceDirect

3. Sweating clues and heat-intolerance history. Parents report irritability in heat; clinicians look for dry axillae and lack of sweat beads after exertion. National Organization for Rare Disorders

4. Nails, teeth, and facial features check. Screens for broader ectodermal dysplasia to refine the subtype and rule out look-alikes. Cleveland Clinic

5. Family pedigree. Charts affected relatives across generations to consider inheritance (autosomal recessive vs X-linked patterns). PubMed+1

B) Manual / simple office tests

6. Dermoscopy of follicular pits. A handheld scope shows funnel-shaped openings, keratin plugs, and perifollicular changes supporting follicular atrophoderma. (Standard dermatology technique.) DermNet®

7. Scratch and scale assessment (“tape test”). Clear tape lifts corneocytes; excessive retention supports abnormal cornification (helpful adjunct). (General method in ichthyosis assessment.) ScienceDirect

8. Thermoregulatory sweat observation. Mild exercise or warm room exposure can show lack of sweat beads; done cautiously in children. (Clinical method aligned with HED assessment.) National Organization for Rare Disorders

9. Moisture/TEWL measurement (instrumented but bedside). Pocket devices estimate skin hydration and water loss, documenting barrier defects over time. (General barrier assessment principle.) ScienceDirect

C) Laboratory & pathological tests

10. Genetic testing panel. Targets ST14 first when ichthyosis + hypotrichosis ± follicular atrophoderma are present; may include other cornification and ectodermal-dysplasia genes to define the exact subtype. PubMed+1

11. Skin biopsy (histology). Shows changes of abnormal keratinization and follicular architecture; helps exclude other causes (e.g., inflammatory scarring alopecias). ScienceDirect

12. Electron microscopy or ultrastructural studies (selected cases). Can reveal specific defects in hair shafts or corneocyte junctions. (Classic research approach in genodermatoses.) ScienceDirect

13. Culture for secondary infection. If oozing or crusting occurs, swabs guide antibiotic choice. (Routine dermatology care.) ScienceDirect

14. Basic labs for nutrition. If growth is poor or skin healing is delayed, clinicians may check iron, zinc, vitamin D, and essential fatty acid status to optimize care (modifiers, not primary cause). (Supportive care principle.) ScienceDirect

15. Filaggrin/profilaggrin immunostaining (research settings). Abnormal processing supports a matriptase-pathway defect in ST14-related disease. PubMed

D) Electrodiagnostic / physiologic tests

16. Quantitative Sudomotor Axon Reflex Test (QSART). Measures sweat output from glands after mild stimulation; reduced values support hypohidrosis. (Standard autonomic/sudomotor test used across sweat disorders and HED.) PMC

17. Thermoregulatory sweat testing (TST) with indicator powder. Visualizes whole-body sweat pattern in a controlled warm room; shows patchy or absent sweating. (Used in ectodermal dysplasia assessment.) PMC

18. Skin temperature recovery after cooling/heat exposure. Physiologic recordings show impaired evaporative cooling when sweat is reduced. (General sudomotor physiology principle.) PMC

E) Imaging / non-invasive visualization

19. High-frequency skin ultrasound or optical coherence tomography (OCT). Non-invasive imaging can quantify epidermal thickening and follicular architecture, useful in specialist centers for documentation and follow-up. (Advanced dermatologic imaging concept.) ScienceDirect

20. Confocal microscopy / trichoscopy (video-dermoscopy of hair). Magnified hair/follicle imaging documents shaft abnormalities and follicular openings without biopsy. (Specialist hair-disorder practice.) ScienceDirect

Non-pharmacological treatments

1. Daily soaking + immediate emollient “soak-and-seal.” Short lukewarm bath; pat dry; thick ointment within 3 minutes to lock water in. Reduces water loss and softens scale. PMC+1

2. Humidifier at home to keep moisture in air and lessen scaling. akademiska.se

3. Gentle, fragrance-free cleansers (avoid harsh soaps/detergents). akademiska.se

4. Mechanical descaling with soft washcloth or silicone scrub while bathing; no scraping. PMC

5. Petrolatum-based occlusion at night to soften thick plaques. akademiska.se

6. Urea/lactic-acid–containing moisturizers (OTC) used as “cosmeceutical” keratolytics. akademiska.se

7. Sun and wind protection (hat, barrier creams) to prevent extra dryness. akademiska.se

8. Heat avoidance/cooling plan (cool packs, shade, breathable fabrics) for hypohidrosis. PMC

9. Sweat-mapping education (Minor test at clinic → personalized cooling zones). Wikipedia

10. Nail/foot care to prevent fissures (pumice + ointment). PMC

11. Bleach-bath protocol (very dilute) if recurrent impetigo; clinician-guided. PMC

12. Psychosocial support (itch/sleep/body-image), especially for children/teens. PMC

13. Trigger diary (weather, soaps, fabrics) to personalize routines. PMC

14. Barrier-repair routines before sports/school in hot climates. PMC

15. Education on safe retinoid use if prescribed (pregnancy precautions, labs). eScholarship

16. Dermoscopic follow-up photos to see changes in pits/scale. PMC

17. Genetic counseling for families (inheritance, testing). akademiska.se

18. Teledermatology check-ins to adjust regimen. PubMed

19. School/work letters for cooling/AC access as needed. PMC

20. Infection-prevention skin hygiene (short nails; quick care of cuts). PMC

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Drug treatments

1. Acitretin (Soriatane®, oral retinoid). Class: systemic retinoid. Dose 10–25 mg daily with fatty meal; time: months. Purpose reduce severe scaling/hyperkeratosis. Mechanism normalizes keratinization. Key risk: strict teratogenicity warnings and long contraception period after stopping. FDA Access Data+1

2. Isotretinoin (Absorica/Accutane®, oral). Class: systemic retinoid. Dose ~0.3–0.5 mg/kg/day; time: months. Purpose thinning of hyperkeratosis when acitretin unsuitable. Mechanism retinoid receptor modulation. Key risk: boxed teratogenicity; iPLEDGE rules. FDA Access Data+1

3. Tazarotene (Tazorac®, topical retinoid). Class: RAR-selective retinoid. Use nightly thin layer to thick plaques; time: weeks. Purpose soften scale; Mechanism retinoid gene regulation. Risk irritation; avoid in pregnancy. FDA Access Data+1

4. Ammonium lactate 12% (Lac-Hydrin®). Class: keratolytic/emollient. Use 1–2×/day; time: continuous. Purpose reduce roughness; Mechanism lactic acid loosens corneodesmosomes and draws water. Risk stinging on cracked skin. FDA Access Data+1

5. Minoxidil topical (2–5% foam/solution). Class: vasodilator for androgenetic alopecia; here off-label trial for hypotrichosis with counseling that response may be limited. Use 1–2×/day to scalp/brows; Risk irritation, shedding phase. FDA Access Data+1

6. Hydrocortisone 2.5% cream (topical steroid). Use short courses on inflamed plaques; Mechanism anti-inflammatory; Risk skin thinning with chronic use. FDA Access Data+1

7. Mupirocin 2% (Bactroban® oint/cream). Use for impetigo or cracked skin with local infection; Mechanism inhibits isoleucyl-tRNA synthetase. Risk local burning; rare resistance. FDA Access Data+1

8. Clindamycin topical (Cleocin T®). Use if folliculitis overgrowth; Mechanism blocks 50S ribosomal unit; Risk irritation; C. difficile warning (rare topical). FDA Access Data+1

9. Oral antihistamine (Hydroxyzine). Purpose itch/sleep help; Dose 10–25 mg at night; Risk sedation; anticholinergic effects. FDA Access Data+1

10. Salicylic-acid keratolytics (Rx strengths). Purpose soften thick scale on palms/soles; Risk salicylism if overused in kids—clinician guidance. (Use Rx labels as per product.) akademiska.se

11. Urea 20–40% Rx creams. Purpose humectant + keratolytic; Risk sting on fissures. (Label varies by product.) akademiska.se

12. Tretinoin topical. Purpose focal follicular plugging; Risk irritation/photosensitivity; avoid in pregnancy. (Use label for specific brand.) PMC

13. Short-course oral antibiotics for secondary infection when needed (e.g., cephalexin, doxycycline per culture/patient factors). Risk GI upset, photosensitivity (doxy). PMC

14. Calcipotriene topical (vitamin D analog) sometimes used for scale modulation on plaques; monitor irritation. (Label per product.) PMC

15. Low-potency steroid + lactic acid combo regimens for inflamed keratotic plaques; short pulses. PMC

16. Emollient prescription bases (e.g., Rx petrolatum/glycerin preparations) used liberally and repeatedly. akademiska.se

17. Antiseptic washes (chlorhexidine) for recurrent impetigo, clinician-guided to limit dermatitis. PMC

18. Ointment-based barrier with occlusion under cotton gloves/socks for fissured hands/feet. akademiska.se

19. Topical retinoid “weekend pulse” strategy when irritation limits daily use. PMC

20. Pain/itch adjuncts (short-term doxepin cream or pramoxine per label) for focal itch—clinician-guided. PMC

Important safety note: These drugs are not “FDA-approved for IHS”. We use their FDA label facts (dose, risks) to guide off-label symptom control in a rare disease. Always individualize with a dermatologist/geneticist. FDA Access Data+3FDA Access Data+3FDA Access Data+3

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Dietary “molecular” supplement

1. Ceramide-rich moisturizers (topical “supplement”). Help rebuild barrier lipids; daily use improves dryness. akademiska.se

2. Omega-3 fatty acids. May reduce inflammation/itch in dry-skin states; modest effect size. PMC

3. Vitamin D (correct deficiency if present) supports skin immunity/barrier. PMC

4. Niacinamide (topical or oral low-dose) improves barrier and reduces TEWL. Skin Therapy Letter

5. Glycerol (glycerin) topical powerful humectant; softens plaques. akademiska.se

6. Lactic acid (as ammonium lactate) keratolytic + humectant; Rx form above. FDA Access Data

7. Urea (topical) combines water-binding + descaling action. akademiska.se

8. Hyaluronic acid topical draws water into stratum corneum. Skin Therapy Letter

9. Zinc (nutritional repletion if low) supports wound healing/infection defense. PMC

10. Probiotics (adjunct) limited data for eczema-like dryness; discuss case-by-case. PMC

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Immunity-booster / regenerative / stem-cell” drugs

At present there are no FDA-approved stem-cell or exosome drugs for skin/hair regeneration in this condition, and the FDA actively warns against clinics selling such unapproved products. For safety and regulatory reasons, I cannot recommend them; families should avoid them outside a regulated clinical trial. U.S. Food and Drug Administration+1

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Procedures / surgeries

1. Fractional ablative laser (CO₂ or Er:YAG) for atrophic pits can smooth texture in atrophoderma-type scarring with careful settings and test spots. Evidence is case-based. PMC+1

2. Dermabrasion / microneedling (specialist use) to blend focal cheek pits; staged, conservative passes. MDedge

3. Excision/repair of nonhealing infected fissures (rare) after medical therapy fails. PMC

4. Eyelid ectropion repair if severe ichthyosis causes lid eversion and exposure (not universal in IHS). PMC

5. Targeted hair-restoration techniques (e.g., cautious minoxidil trials; surgical options limited due to follicular pathology). FDA Access Data

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Preventions

Stay moisturized (2–3×/day), avoid harsh soaps, use humidifier, wear breathable cotton/linen, plan cooling in hot weather, protect from sun/wind, keep nails short, treat cracks fast, keep a trigger diary, and schedule regular derm/genetics check-ups with photos to track change. akademiska.se+1

When to see a doctor (red flags)

See a dermatologist early for diagnosis and gene testing; urgently if you have fever with spreading skin redness (infection), painful deep cracks, overheating episodes due to poor sweating, eye irritation not settling, or rapid new skin bumps (to exclude cancer in BDCS look-alikes). Orpha.net+1

What to eat / avoid

Eat balanced meals with adequate protein, vegetables, fruits, healthy fats (omega-3), and stay well-hydrated. Limit very spicy foods or alcohol if they trigger flushing/itch. Avoid extreme vitamin A supplements if on retinoids. Discuss iron and vitamin D if you have fatigue or frequent infections. PMC

FAQs

1. Is there a cure? Not yet; care is supportive and personalized. PMC

2. What gene is most common? ST14 (matriptase). PMC

3. Why do I overheat? Poor sweating (hypohidrosis) + thick scale traps heat. PMC

4. Can hair regrow? Sometimes limited gains with minoxidil; follicles may be structurally affected. FDA Access Data

5. Are retinoids safe? They help scale but need strict pregnancy precautions and monitoring. FDA Access Data

6. Do moisturizers really matter? Yes—daily emollients are the backbone of care. akademiska.se

7. Is this contagious? No; it’s genetic. Orpha.net

8. Should my family get tested? Genetic counseling/testing is helpful for relatives. Orpha.net

9. How often to bathe? Short daily soak/rinse is fine if you seal with ointment after. akademiska.se

10. Best climate? Moderate humidity and cool temperatures. akademiska.se

11. What about “stem-cell creams”? Not FDA-approved; avoid clinic products marketed for skin/hair. U.S. Food and Drug Administration

12. School or sports? Yes—with cooling plans and moisturizers before activity. PMC

13. Laser for cheek pits—does it work? Case reports show improvement; results vary; discuss risks. PMC

14. Can infections be prevented? Good hygiene, quick crack care, and early topical antibiotics help. FDA Access Data

15. What’s new in research? Work is ongoing on pathway-based therapies (gene/enzyme replacement; biologics) for ichthyosis. BioMed Central

Disclaimer: Each person’s journey is unique, treatment plan, life style, food habit, hormonal condition, immune system, chronic disease condition, geological location, weather and previous medical  history is also unique. So always seek the best advice from a qualified medical professional or health care provider before trying any treatments to ensure to find out the best plan for you. This guide is for general information and educational purposes only. Regular check-ups and awareness can help to manage and prevent complications associated with these diseases conditions. If you or someone are suffering from this disease condition bookmark this website or share with someone who might find it useful! Boost your knowledge and stay ahead in your health journey. We always try to ensure that the content is regularly updated to reflect the latest medical research and treatment options. Thank you for giving your valuable time to read the article.

The article is written by Team RxHarun and reviewed by the Rx Editorial Board Members

Last Updated: October 06, 2025.