There are many causes of acne, such as acne, perifollicular keratosis, etc. You can choose retinoic acid cream and salicylic acid ointment for better treatment. 1. Acne: Patients who have acne due to acne can use Vitamin A cream application to regulate epidermal keratin, improve keratinization of follicular opening, anti-inflammatory, and also use ointment such as erythromycin and clindamycin. It is important to note that these drugs may have side effects such as itching and stinging of the skin after use, and are contraindicated for those who are allergic to the ingredients. Severe cases can also be treated with oral isotretinoin and other drugs under the guidance of a doctor to rule out relevant contraindications. In addition, photorejuvenation, red and blue light irradiation and other photoelectric therapy for this disease also has a certain degree of improvement. 2. Keratosis pilaris: Keratosis pilaris can also lead to acne symptoms, patients can use vitamin A acid cream, urea cream, salicylic acid ointment, cod liver oil ointment and other smear treatment, a small number of patients may appear redness of the skin, tingling, peeling, etc., pregnancy, lactation, women, children are prohibited. The cause of acne may also be allergies and other reasons, it is recommended that patients urgently to the hospital interview, clear reasons for acne to do targeted treatment, under the guidance of the doctor to use medication, to avoid unauthorized use of medication.