A lot of small bumps and bumps on the face may be caused by acne, atopic dermatitis, milia and other diseases. 1. Acne: The cause may be related to factors such as changes in hormone levels, excessive sebaceous gland secretion, and inflammatory reactions. Patients will have symptoms such as pimples, acne and pustules, which are commonly found on the cheeks, forehead and jaw. 2. Atopic dermatitis: the cause of the disease is mainly related to genetics, immune abnormalities, skin barrier damage and other factors. Patients will have localized dryness, papules, itching and other symptoms, which can be seen on the face, scalp, trunk and other parts of the body. 3. Milia: the cause may be related to heredity, skin damage and other factors. Patients will appear multiple local yellowish-white papules, papules surface smooth, mostly the size of a needle tip, commonly in the face. There are many reasons why there are a lot of small bumps protruding from the face, so it is recommended to go to a regular hospital to clarify the cause of the disease.