The common cause of pimples turning into hard lumps on the face is the formation of nodules, keloid scars, etc. The causes are different and the treatments are different, so you should consult a doctor in time, and you can choose to undergo medication, physical therapy or surgical treatment. 1. Acne nodules, if the acne is not serious, you can use Vitamin A cream, benzoyl peroxide and other medications under the guidance of the doctor, which can appropriately relieve the symptoms of acne hard lumps. You can choose to undergo laser treatment, liquid nitrogen cryotherapy or red and blue light irradiation can effectively relieve the symptoms. If the acne hard lumps are large, repeated treatment can not achieve better results, you can choose intradermal injection of tretinoin and other drug therapy; with abscess symptoms, you can choose to carry out incision and drainage. 2. Keloid, if keloid, need to actively seek medical treatment for surgical treatment, excision of scar, or choose to lesion injection compound betamethasone and other closed treatment, improve the condition. Usually it is best not to often stimulate the acne place, but also need to maintain good eating habits, light diet.