Hello, Blackheads are commonly caused due to the blocking of the pores due to secretion of sebum. It occurs when the skin is not kept adequately clean and dirt, skin cells and bacteria get accumulated. It may occur due to hormonal imbalances. You are suggested to get your hormones checked. To prevent blackheads, brown spots and acne, cleanse your face 3-4 times a day with herbal face wash and rose water. You can exfoliate once a week. Avoid addictions if any, take a balanced diet with more fruits & veggies than non veg food. Take regular showers. You can use topical retinoids. Use tumeric based face packs regularly. You can apply ointment Betnovate C in the area affected at bed time to get rid of the scars. You are suggested to get clinically examined by a dermatologist for laser treatment for better skin. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Nupur K., General & Family Physician