The causes of forehead acne include Propionibacterium acnes infection, keratinization of follicular sebaceous gland ducts, and androgens and so on, which can be eliminated by medication and physical therapy. 1. If the symptoms are mild, benzoyl peroxide can be used externally to kill Propionibacterium acnes as prescribed by the doctor; if necessary, minocycline and other antibiotics can be taken orally to kill Propionibacterium acnes; blue light and other physical treatments can also have a bactericidal effect. 2. For severe cases, topical tazarotene and oral retinoids such as viamin can be prescribed to improve the keratinization of the sebaceous gland ducts of the hair follicles; photodynamic therapy can also improve the symptoms. 3. For the high level of androgens caused by, can be prescribed oral spironolactone and other inhibitors of androgens, reduce sebum secretion. It is recommended that people with forehead acne go to a regular hospital in time to clarify the cause of the disease and standardize the treatment under the guidance of the doctor.