Acute acneiform mossy furuncle belongs to a type of parapsoriasis, which is why it is also known clinically as acute pitting parapsoriasis. It may be confused with pitting psoriasis and can be differentiated by skin biopsy. 1. Pathogenesis: The pathogenesis of acute acneiform mossy furuncle is not very clear at present, which may be caused by allergic factors. Some patients may also have autoimmune diseases. 2. Clinical manifestations: acute acneiform mossy chaff rash occurs on the trunk, limbs and other parts of the body, the head and face, as well as the hands and feet rarely occur. The skin lesions are scattered macules, papules or erythema, the color is light red to brown, scrape off the scales on the surface of the skin lesions, there is no symptom of punctate hemorrhage. For the existence of acute acneiform mossy furuncle patients, it is recommended to go to the regular hospital in time for examination, under the guidance of professional doctors for treatment.