Scutula is classically observed in wof

Favus:- *Characterized by presence of foul- smelling, Yellow cup-shaped crusting (scutula) on scalp; ahroconidia and airspaces within hair shaft . * often results in cicatricial alopecia. Causative organism:- T. schoenleinii > M. gypseum, T. violaceum. Ref:- Review of Dermatology by Alikhan; pg num:- 305,306