A 30-year-old male patient presents to you with inflammatory alopecia. Which of the following variants of tinea capitis infection commonly result in this type of alopecia?

Explanation

## Correct Answer: B. Favus and Kerion Inflammatory alopecia in tinea capitis is characterized by a host inflammatory response to dermatophyte infection, resulting in pustules, exudation, and hair loss. Two variants specifically cause this inflammatory presentation: **Kerion** and **Favus**. Kerion is an acute, severe host inflammatory response to dermatophyte infection (typically *Trichophyton tonsurans* or *Microsporum canis*), presenting as a boggy, pustular, suppurative lesion with regional lymphadenopathy—the most inflammatory form of tinea capitis. Favus (caused by *Trichophyton schoenleinii*, endemic in India and Middle East) presents with scutula (cup-shaped crusts) and permanent scarring alopecia due to chronic inflammation destroying hair follicles. Both are classified as **endothrix** infections (fungal spores within the hair shaft), but the question specifically asks for variants that cause inflammatory alopecia, not the spore location. Ectothrix infections (spores outside hair shaft) like *Microsporum audouinii* typically cause non-inflammatory, non-scarring alopecia. The key discriminator is that kerion and favus both produce significant inflammation and potential permanent hair loss, making them the clinically relevant answer for inflammatory alopecia. ## Why the other options are wrong **A. Kerion and Endothrix** — This is wrong because it conflates morphological classification (endothrix vs ectothrix, based on spore location) with clinical presentation (inflammatory vs non-inflammatory). While kerion is indeed inflammatory, 'endothrix' is not a clinical variant—it's a taxonomic category that includes both inflammatory (favus, kerion) and non-inflammatory forms. The question asks for variants causing inflammatory alopecia, not spore morphology. **C. Ectothrix and Endothrix** — This is wrong because it lists only morphological classifications without addressing clinical presentation. Neither ectothrix nor endothrix alone defines inflammatory alopecia. Ectothrix infections (e.g., *Microsporum audouinii*) typically cause non-inflammatory, non-scarring alopecia. This option misses the specific inflammatory variants (kerion and favus) that the question targets. **D. Endothrix and Favus** — This is wrong because 'endothrix' is a morphological classification, not a clinical variant. While favus is correct as an inflammatory variant, pairing it with the broad category 'endothrix' is imprecise. The question requires two specific clinical variants (kerion and favus), not a morphological category. This represents confusion between taxonomic and clinical classification systems. ## High-Yield Facts - **Kerion** is an acute, severe host inflammatory response to dermatophyte infection, presenting as a boggy, pustular, suppurative lesion with regional lymphadenopathy—the most severe form of tinea capitis. - **Favus** (caused by *Trichophyton schoenleinii*, endemic in India) presents with scutula (cup-shaped crusts) and permanent scarring alopecia due to chronic inflammation destroying hair follicles. - **Ectothrix** infections (spores outside hair shaft, e.g., *Microsporum audouinii*) cause non-inflammatory, non-scarring alopecia—opposite of inflammatory alopecia. - **Endothrix** is a morphological classification (spores inside hair shaft), not a clinical variant; it includes both inflammatory (kerion, favus) and non-inflammatory forms. - Kerion requires systemic antifungal therapy (griseofulvin or terbinafine) plus oral corticosteroids to control inflammation; topical agents alone are insufficient. ## Mnemonics **KFAB Rule for Inflammatory Tinea Capitis** **K**erion and **F**avus = **A**lopecia (inflammatory). **B**oth cause permanent hair loss. Use when distinguishing inflammatory from non-inflammatory variants. **Spore Location ≠ Clinical Severity** **Endo/Ecto** = where spores sit (morphology). **Kerion/Favus** = how inflamed it gets (clinical). NBE often mixes these—don't confuse taxonomic classification with inflammatory presentation. ## NBE Trap NBE pairs morphological classification (ectothrix/endothrix) with clinical variants (kerion/favus) to trap students who conflate spore location with inflammatory severity. The question specifically asks for variants causing inflammatory alopecia, not spore morphology—a common confusion in Indian dermatology exams. ## Clinical Pearl In Indian clinical practice, kerion is often misdiagnosed as bacterial infection and treated with antibiotics alone, delaying systemic antifungal therapy. Favus, endemic in parts of India, causes permanent scarring alopecia if not treated early—emphasizing the need for prompt diagnosis and systemic therapy in both variants to prevent irreversible hair loss. _Reference: Robbins Ch. 25 (Infectious Diseases); Park's Textbook of Preventive and Social Medicine (Dermatological infections); OP Ghai Essentials of Pediatric Nursing (Tinea capitis variants)_