Old recurring acne, consider acne, can take general treatment, topical drugs, systemic drugs, phototherapy and other measures. 1. General treatment: keep the skin clean and hygienic, pay attention to oil control and moisturizing, avoid squeezing and scratching with hands, and appropriately limit the intake of high glycemic foods and milk that may trigger or aggravate acne. 2. Topical medications: Commonly used medications include retinoic acid cream, benzoyl peroxide gel, and fusidic acid cream. 3. Systemic medications: antibiotics such as doxycycline and minocycline, together with isotretinoin, as well as anti-androgenic medications such as spironolactone and birth control pills. 4. Phototherapy: commonly used methods include photodynamic therapy, LED blue light or red light irradiation. It is recommended that patients go to the hospital for examination and treatment under the guidance of the doctor. The above drugs should be used according to the doctor’s instructions.