Cryptosporidium dermatitis is an acute dermatitis caused by contact with the body fluids of toxic cryptosporidium. Brief diagnosis] 1, lesion characteristics: striated, patchy or dotted clusters of edematous erythema, on which dense small blisters and pustules, partly fused into large blisters, can be followed by erosion, crusting. 2.Distribution: It occurs in exposed areas, such as face, neck, limbs, etc. 3.Self-perceived symptoms: obvious itching, burning pain or burning sensation. 4.It may be accompanied by fever, dizziness, nausea, vomiting, local lymph node enlargement, etc. 5, the disease is more frequent in summer and autumn after the rain and sultry weather. Prevention points] 1, found under the light flying insects flocking, can spray insecticide. 2.Don’t sleep under the light. 3.Once you find the insect body of the cryptophid falling on the skin, immediately blow it away or gently pluck it away, do not pat and crush it with your hands. Prevent contact with its body fluids. Treatment】 1. If the rash has appeared, wash the skin with soap and water as soon as possible. 2. Topical medication: apply glucocorticoid ointment or furnace glycolic lotion. If there are pustules, add antibacterial drug (mupirocin) ointment. If the pustules fuse into pieces or vesicles, exudate, according to the principles of treatment of acute dermatitis, available 1:5000 potassium permanganate solution cold wet compress, and then coated with zinc oxide oil. 3, internal antihistamines: loratadine, paracetamol, etc.