Purple pimples may be caused by subcutaneous bleeding, or by nodular acne or folliculitis, and require targeted treatment, such as medication, under the guidance of a doctor. 1. Subcutaneous bleeding: Habitual squeezing of acne may cause the capillaries under the skin to rupture, resulting in mild, unbroken subcutaneous bleeding, which darkens the color of the skin at the site of squeezing (dark red or blackish-purple). Consider giving medications such as vitamin C tablets orally and sterilizing the incision for drainage if necessary. 2. Nodular acne: As acne progresses, dark red or purple-black nodules of varying sizes may form. Consider giving topical retinoids such as retinoic acid cream or antibiotics such as clindamycin cream; if necessary, take oral antibiotics such as minocycline and erythromycin, and retinoids such as isotretinoin. 3. Folliculitis: can be caused by bacterial, fungal and other pathogens infection caused by hair follicle inflammation, manifested as red or purple papules around the hair follicle. For bacterial infections, consider topical mupirocin ointment and oral cefuroxime; for fungal infections, consider topical ketoconazole cream and oral itraconazole. The above situation, it is recommended that the patient consult a doctor in a timely manner, by the doctor to clarify the cause, to give targeted treatment, do not blindly self-medication. The above medications should be used in accordance with medical advice.