The cause of lichen planus is still unclear, and may be related to infection, immunity, abnormal lymphocyte proliferation and other factors . The two clinical types of lichen planus are usually divided into acute acne-like lichen planus and chronic lichen planus (pitting-type psoriasis). Acute acne vulgaris is characterized by red, edematous papules with blisters or pustules in the center of the papules. Chronic zygomycosis is characterized by reddish-brown, mossy papules on the surface of the skin, and the central part of the lesions may be covered with scales. 1. Infections: mossy furfurfura may be associated with bacterial and viral infections, such as varicella zoster virus, EBV, adenovirus, staphylococcus, streptococcus, mycoplasma and toxoplasma, and other pathogens. 2. Immunity: mossy furfura is also associated with immune complexes and cell-mediated immune responses, and some patients are also associated with immune system diseases, such as rheumatoid arthritis, hypothyroidism and pernicious anemia. 3. Abnormal lymphocyte proliferation: mossy furfura is a disease related to abnormal T cell proliferation, according to research, mossy furfura patients are detected in the skin lesions of dominant T cell clonal proliferation. If you are diagnosed with zygomycosis, it is recommended that you go to the hospital in time for treatment and take the medication as prescribed by the doctor during the treatment period. At the same time, you need to pay attention to avoid scratching the itchy areas with your hands, so as to avoid secondary infections, which can further aggravate the condition.