The spots that appear on the chest are mostly due to lichen planus infection, which is caused by fungal infection, and it is best to perform fungal microscopy to help clarify the diagnosis. Tinea pilaris is associated with moist and sweaty skin, and some patients may also have anemia and abnormal blood sugar, which can easily lead to the growth of fungi. It is recommended that corrective treatment be given in a timely manner. Topical antifungal medications, such as bifenbendazole cream, can be given locally; also, ketoconazole lotion or selenium disulfide lotion can be given in the shower, rubbed until it foams, left on the body for 5 minutes and then rinsed off; itraconazole can also be given orally for recurring patients, and care must be taken to use the medication under the guidance of a doctor and not on your own. Generally lichen planus is prone to recurrence and it is important to pay attention to clean skin and avoid excessive sweating.