This is often mistaken for a bacterial folliculitis at first. M. canis has a positive reaction to Wood's light but other fungi do not and have to be identified by cultures of epilated hair. Generally T. mentagrophytes produces dry inflammatory nodules, while T. rubrum and others produce more chronic infections similar to sycosis barbae. Treatment with griseofulvin for several months clears almost all cases. Tinea Corporis Annular or polycyclic marginated scaly erythemas, occasionally plaques suggesting psoriasis , and less often granulomatous nodules are found.
Verrucous lesions are rare.
This disorder is generally candidiasis if the scrotum is involved, otherwise the classic jock itch with the distinct margin can be caused by E. floccosum , T. rubrum or T. mentagrophytes . Tinea Manum and Pedis Tinea is vesicular if caused by T. mentagrophytes and dry, branny and scaly if caused by T. rubrum . Occasionally monilia will produce a margin halfway up the palm. The most common pattern of hand involvement is for a single hand to be involved while both feet are involved in a moccasin distribution scaling typical of T. rubrum . Griseofulvin has certainly helped in the management of these cases, particularly the T. rubrum cases, but it is still amazing how many people do not seem to get complete clearing with oral griseofulvin.