The main treatment modalities for 40-year-old adults with recurring acne include general treatment, medication, and other treatments. 1. General treatment: acne is easy to recur and the treatment process is slow. In daily life, attention should be paid to facial cleansing, using warm water and neutral soap to clean the face to prevent oil from clogging the pores. Avoid spicy and stimulating foods in daily life, pay attention to rest, and avoid staying up late. 2. Medication: mainly include external drugs and internal drugs. (1) Topical drugs are mainly emulsions or creams, including retinoids such as 0.1% adapalene gel and tazarotene. Different concentrations of benzoyl peroxide lotions, emulsions or gels can be used to treat acne. Antibiotics such as fusidic acid cream, erythromycin ointment and azelaic acid and selenium dioxide may also be used. (2) Internal medications mainly include antibiotics such as minocycline and doxycycline, etc. Retinoids such as oral isotretinoin is the standard treatment for severe acne, birth control pills and spironolactone can be used for acne accompanied by hyperandrogenic manifestations, and glucocorticosteroids such as prednisone can be taken by patients with polymerized acne and fulminant acne, but long-term high-dose use should be avoided. 40-year-old adults with recurring acne should be treated in a timely manner, using medication under the guidance of a doctor, paying attention to daily facial cleanliness, eating a light diet, and developing good living habits.