Lichen planus, also known as lichen planus furfur, is a fungal skin infection that is not usually contagious. Lichen planus is a chronic superficial fungal infection caused by Malassezia infection of the stratum corneum of the skin. It may appear as a patchy rash in the early stages, and then progresses to large, irregular patches, favoring areas with high sebaceous gland secretion. Triggers of pityriasis versicolor include family genetics, hot and humid environment, excessive oil secretion and sweaty body. Although pityriasis versicolor is a fungal infection, it is not contagious because the causative fungus, Malassezia, is present in everyone, and it is only when the triggers persist that pityriasis versicolor may result. The treatment of florid chafing rash is mainly antifungal treatment, you can follow the doctor’s instructions for local application of ketoconazole cream, terbinafine cream, etc.; can also be taken orally antifungal drugs, such as fluconazole, itraconazole and so on. The appearance of florid chaffing rash need to be timely treatment, need to use drugs under the guidance of the doctor, not private medication.