My forehead acne got worse, so I went to a dermatologist and applied prescription medication to no effect... I went to a treatment clinic and got a recommendation for a black peel. It wasn't a famous procedure and it only cost 100,000 won for peeling, so I wasn't willing to do it, but I tried to fool myself and the results were really good. My forehead became smooth too. This is my first time knowing about it... I recommend it for skin care.