Acne, or acne vulgaris, takes one to three months for pimple-predominant acne, two to six months for inflammatory acne, and more than six months for nodule- and cyst-predominant acne after regular treatment. Acne is a disease characterized by pimples and comedones on the face caused by Propionibacterium acnes infection and high oil secretion. If acne is short-lived and dominated by pimples and papules, the prognosis is usually better with treatment. If it is predominantly nodules and cysts and has a longer history, it generally takes longer to heal and has a poorer healing. In the course of acne treatment, you should reduce the intake of high oil and high sugar foods, avoid sun exposure, use sunscreen clothing and topical sunscreen, and pay attention to the regularity of work and rest, which can shorten the duration of acne. Acne should be treated in a timely manner, and timely treatment is generally more effective and shorter in duration.