Superficial mycosis are very common. The frequency in France is 10 to 15% of the population. The reason for the high incidence of this disease is the change of the moral values, rise in promiscuity and increase sports activities. The agents responsible are divided in four groups. Dermatophytes involve keratin of the skin, hairs and nails but never the mucous membranes. They can cause glabrous skin lesion, tinea corporis, tinea capitis or onychomycosis. Yeast are divided in two groups: the candidiasis and Malassezia furfur, the etiologic agent of pityriasis versicolor. Oral mucosa candidiasis is very common in HIV infected patients.