Dermatophytes:

• Causative agent of Ringworm or Tinea or Dermatophytoses .
• Not involve living Tissues.
• It has 3 genera – Trichophyton, Microsporum , Epidermophyton.
• In lesion, it form hyphae and arthospores.
• In culture it form septate hyphae and asexual spores (micro and macroconidia) with powdery and pigmented colonies.
• They are differentiated mainly by nature of macrocondia.

Clinical features

• Local inflammation is due to irritation by fungal products and hypersensitivity reaction.
• Transmission occurs from infected to uninfected person often by brushes, combs and towels.
• Clinically ringworm is classified depending on the site involved eg. Tinea capitis infect scalp and hair.
• MC species infecting human being – T. rubrum

Kerion

• The fungal infection of scalp caused by microsporum or trichophyton species not by epidermophyton.
• Inflammatory boggy swelling covering small or large areas of scalp in which hair are loose and fallout or can be easily epilated.
• Commonly caused by zoophilic dermatophytes like T. mentagrophytes and T. verrucosum.
• Follicular scarring and partial alopecia is common after severe kerion.

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