Hi, i am 29 Female. I do suffer from acne on my both cheeks. I used to treat them well with benzoyl peroxide, gentle face wash and moisturiser. I've stopped using benzoyl peroxide due to its harshness. It has been about 6 months since I have stopped using it. I noticed lately that I have these 'patches' 'swelling' 'welts' on my skin. I'm not sure what it is. But I have attached a picture of it. i have been have this for about 3-4 months. it has not gone away. What can i do to get rid of it?