What causes pimples on the forehead and chin?

Acne on forehead and chin may be caused by acne, folliculitis, contact dermatitis, etc.
1. Acne: Chronic inflammation at the forehead and chin caused by the proliferation of Propionibacterium acnes and the overproduction of sebaceous glands due to high levels of androgens, manifesting itself as localized pimples.
2. Folliculitis: the skin follicles on the forehead and chin are infected by bacteria and other pathogens, causing local inflammatory reaction and acne.
3. Contact dermatitis: forehead chin contact cosmetics and other allergens, can cause the body to occur immune abnormalities, the phenomenon of long pimples, can be accompanied by itching, pain and other symptoms.
It is recommended to go to the hospital in time for forehead and chin acne, to clarify the cause of the disease, and standardized treatment under the guidance of the doctor.