The red spots on the stomach can be caused by a variety of reasons, such as insect bite dermatitis, eczema, psoriasis, pityriasis rosea, etc. 1, insect bite dermatitis: insect bite skin and dermatitis caused by dermatitis. Summer and autumn, the general rash can fade on its own. The basic damage is spindle-shaped bright red windbag-like damage. Insect bite dermatitis is mainly treated with symptomatic and anti-allergic therapy. The topical medications, such as Denide cream, and in severe cases, oral antihistamines, such as cetirizine, are recommended under medical supervision. 2. eczema: the occurrence of this disease is related to the interaction of various internal and external factors, such as infection, endocrine disorders, food, and various chemical substances, and can occur on any part of the body surface, often manifesting as pinpoint corn-sized papules and papules on an erythematous basis. The patient itching is obvious, scratching, hot water washing can aggravate the lesions. 3, psoriasis: the cause is unknown, may be the result of genetics, environment and other factors acting together, can involve the whole body. The skin lesions of common psoriasis are red papules or macules, which gradually expand and fuse into red plaques. Patients mostly feel varying degrees of itching. 4, rose pityriasis: the cause of the onset is unknown, may be related to viral infection. Patients can appear isolated rose-colored light red patch-like lesions, often accompanied by varying degrees of itching. The disease is self-limiting, the course of the disease varies from several weeks to half a year. The specific diagnosis of the disease needs to be combined with clinical manifestations and auxiliary examinations, and hospital consultation is recommended to standardize treatment after a clear diagnosis.