Inflammation and redness of pimples (acne) on forehead should be improved by general treatment, medication and physical therapy. 1. General treatment: Patients with acne and inflammation on forehead should develop good living habits and avoid staying up late for a long time. Pay attention to personal hygiene, keep the skin clean, and remove makeup in time. 2. Medication: patients can use topical retinoids, such as retinoic acid, tazarotene, etc., combined with the use of antibacterial drugs, such as erythromycin, clindamycin, etc., can play an anti-inflammatory effect. If the external drugs are ineffective, patients can also take oral antibiotic drugs, such as tetracycline, doxycycline, etc.. 3. Physical therapy: In addition to the above treatments, patients can also choose photodynamic therapy, which destroys the Propionibacterium acnes bacteria through photodynamic effect and reduces the inflammatory reaction at the same time. If acne on the forehead is inflamed, red, swollen and painful, patients are advised to go to the hospital and cooperate with the doctor for standardized treatment.