Skin bumps may be related to urticaria, folliculitis, acne and other diseases, the patient will appear local erythema, pimples and other symptoms. 1. urticaria: skin bumps are considered to be related to urticaria, related to allergies or their own constitution and other factors, the clinical manifestations of erythema, wheal and angioedema, the size of the wheal varies, the number of different, pale white or red, accompanied by itching. 2. Folliculitis: localized due to bacterial or fungal infection and localized follicle-centered red papules or papules, may be accompanied by itching or pain. 3. Acne: caused by blockage of follicle openings, exuberant sebaceous gland secretion, Propionibacterium acnes infection, etc. It may be aggravated by staying up late and eating spicy and stimulating foods. If the symptom of skin bumps appears, it may be caused by the above mentioned diseases, and it is recommended to go to a regular hospital to find out the cause of the disease.