Hard bumps on the face may be caused by acne, contact dermatitis, sebaceous cysts, the patient should consult a doctor in time to clarify the cause of the disease and then carry out appropriate treatment. 1. Acne: hard bumps on the face may be acne, usually more than one, mostly in the 15-25 years old teenagers, there will be localized pain, such people should pay attention to facial cleanliness, do not stay up all night. 2. Contact dermatitis: contact dermatitis can also cause hard bumps on the face, the patient will also have localized erythema, blisters, itching, can be treated with topical glycerite. 3. Sebaceous cysts: hard bumps on the face and is single, it should be considered sebaceous gland caused by cysts, and its secondary infection can be localized pain, can be surgically removed. The above medications and operations should be carried out under the guidance of a doctor.