Persistent pimples and dark marks on the face and back can happen when acne remains active for a long time, pores stay clogged, or the skin gets irritated from repeated breakouts, sweating, oily products, stress, or hormonal changes. Sometimes using multiple creams together without proper guidance can also irritate the skin and make marks take longer to fade. Tretin and skin-lightening creams may help some people, but improvement is usually slow and depends on the type of acne and skin sensitivity. Treatment should be taken only if prescribed by your doctor. A dermatologist may suggest a different acne routine, medicated face wash, chemical peels, or other treatments if current products are not helping. Try to wash the face gently twice daily, avoid squeezing pimples, keep pillow covers clean, and use sunscreen regularly because sunlight can darken acne marks further. Reducing oily junk foods, sleeping well, and managing stress may also support skin healing. If acne becomes painful, leaves scars, or keeps spreading, it is better to get a proper skin evaluation.