black heads are caused when the oil secreting sebaceous glands are blocked. the oil is oxidised on exposure to air and becomes- what is called black heads. you need to keep these pores clear if you have a bad problem you initially might need a treatment- from a specialist to get rid of them then you can prevent them from forming by drinking plenty of water and washing your face 2-3 times per day you can use a gentle scrub. Steam your face- carefully at home this opens up your pores once the pores open use a gentle facial scrub to clean your face and then wash your face with cold
water to close the pores.