Cryptorchid dermatitis is a type of dermatitis caused by human skin exposure to the venom of the cryptorchid. Clinical manifestations: The lesions are erythematous, pustular, streaky, punctate and flaky, with small pustules arranged in strips or irregularly. The dotted ones are bright red papules and plaques about the size of green beans or slightly larger, and there are also small pustules on the surface, isolated and scattered or several arranged in strips or clusters. The skin of the face, neck, upper and lower extremities and trunk are mostly affected, and the skin of the pubic area is also often involved. In a few patients with extensive lesions and significant inflammation, systemic symptoms such as headache, dizziness and fever are often present. Patients may feel a severe burning pain and itching. Usually healed within 1-2 weeks, leaving pigmentation or hypopigmentation spots after healing. Prevention and treatment: 1. Pay attention to environmental hygiene, eliminate insects, should be installed with screens, sand doors, etc. to prevent the entry of flying insects. When the flying insects contact human skin, do not shoot the insects on the skin surface by hand, or squeeze the insects, they should be blown off or plucked off, and then trampled to death. 2, treatment should be washed with soapy water as early as possible to clean the skin, and then external rubbing 1% mint stovepipe lotion or corticosteroid creams such as paregoric pine, alloxan, etc., can also be used externally Longzhu ointment, full scorpion cream. If the exudation is obvious, wet compresses of Amaranthus aureus decoction, or boric acid solution or potassium permanganate solution can be used. For secondary infection, topical application of Bactrim and antibiotic ointment can be used. Oral anti-allergy drugs, such as loratadine, epalrestin, etc. If inflammation is obvious, you can order compound glycopyrrolate injection, glucocorticoid, antibiotics, etc.