Lichen planus is generally referred to as lichen planus furfur, which is somewhat contagious. Lichen planus is a fungal infection of the superficial layers of the skin caused by Malassezia, commonly found in young and middle-aged men, occurring in sebaceous gland-rich areas such as the face and neck, the forehead, the back of the shoulder, the upper arm, the armpit, etc. The patient may have a dotted rash of brown, light brown, light red, etc., and generally have no self-awareness of the symptoms, and occasionally mild itching and so on. Since florid furosemide is caused by pathogenic bacteria infection, it is somewhat contagious. Patients with pityriasis versicolor can use topical medications, such as ketoconazole cream, or oral medications, such as itraconazole, under the guidance of a doctor. It is recommended that patients consult a doctor in time, actively cooperate with the doctor’s treatment, and strictly follow the doctor’s instructions for medication.