Wearing a mask with a lot of small bumps on the face may be caused by follicular pore blockage or allergic factors. 1. Follicular pore blockage: the body androgen level is too high, oil secretion is more, wearing a mask for too long, not timely cleaning, may lead to follicular pore parts of the blockage, sebaceous glands secretion of sebum can not be discharged, it will make the face appear a lot of acne. 2. Allergic factors: the use of some poor quality masks, may lead to facial skin allergic reaction, will also make the face appear a lot of small pimples, can be manifested as red papules, may also be accompanied by itching and other symptoms. Wearing a mask with a lot of small bumps on the face, with obvious abnormal symptoms or a long time can not subside, it is recommended to consult a doctor for appropriate examination and treatment.