Boys lose skin on the sexual organs may be due to circumcision, scrotal eczema, contact dermatitis and other diseases. 1. Hypercircumcision: the common cause of this disease is congenital adhesion of the foreskin to the head of the penis and narrowing of the outer opening of the foreskin. When the foreskin is too long, there will be foreskin scale, which is mainly composed of sebaceous gland secretion and epithelial tissue flaking, so there will be the phenomenon that the boys’ organs have lost their skin. 2. Scrotal eczema: the etiology of the disease is not clear, may be related to abnormal immune function, mental stress, heredity, humid environment, foreign body friction and other factors. Generally in the subacute and chronic phases, the scrotal skin will appear flaking, itching and other symptoms, which can be manifested in the boys’ organs on the skin. 3. contact dermatitis: this disease is mainly due to the boys organ contact skin exogenous substances, triggering an allergic reaction, such as underwear, condoms, soap, etc., the typical symptoms of erythema, edema, flaking, etc., so, the boys organ on the skin may be contact dermatitis caused. When the boy’s organ fell on the skin, need to go to the hospital to improve the relevant examination, clear specific causes.