Hard nodular acne hardness generally refers to nodular cystic acne, which can be eliminated through general treatment, medication and physical therapy. 1. General treatment: avoid squeezing with hands, avoid using cosmetics, avoid consuming high sugar, greasy, spicy and stimulating food, avoid staying up late, etc. 2. Drug therapy: can be used externally with retinoids such as adapalene gel, antibiotics such as fusidic acid, nonadrenergic acid water yanking drugs, at the same time, combined with oral retinoids such as isotretinoin, antibiotics such as minocycline, hormones such as prednisone and other drugs. It needs to be used according to the patient’s condition under the guidance of the doctor. 3. Physical therapy: light therapy such as red and blue light irradiation, photodynamic therapy and other physical methods can be used to relieve symptoms. If the above situation occurs, it is recommended to go to the hospital in time, and standardize the diagnosis and treatment under the doctor’s guidance, so as to avoid delaying the condition.