The appearance of many small bumps on the face may be due to allergies, insect bites, acne and other factors. 1. Allergy: contact with allergens may trigger an allergic reaction, pimple-like lesions on the face, which may be accompanied by itching or localized burning sensation, common allergens are seafood, pollen, willow, animal hair and so on. 2. Mosquito bites: mosquito bites on the skin of the face will trigger an immune-paradoxical reaction, the face will appear red pimples, doughnut-like lesions, there may also be itching and pain. 3. Acne: The disease is related to abnormal androgen levels, increased sebum secretion, Propionibacterium acnes reproduction and other factors, the patient’s face may appear whiteheads, blackheads, inflammatory papules and other lesions. There are many factors that lead to the appearance of many small bumps on the face, and it is recommended that patients consult a doctor in time to identify the cause of the disease and then carry out the relevant treatment.