A cavernous rash on the bottom of the foot is considered a high probability of keratolytic fossa. Vulgaris is a superficial skin infection of the bottom of the foot caused by a variety of bacteria. It is not known exactly what kind of pathogenic infection is present, but it occurs in moist areas, so moisture may be a trigger. The main treatment is to avoid damp and sweaty feet, and to avoid the habit of wearing shoes and not having bare feet. The lesions can be given erythromycin ointment, fusidic acid cream or miconazole cream and other topical applications can also be given erythromycin oral, generally need continuous medication for a week, usually pay attention to keep the feet clean and dry.