my sister has this type of acne.. almost a cyst type acne. it’s kinda red and it’s been there for almost a year and it is driving her crazy. it’s not very big but it’s still noticable. you cant pop it or anything like that.. she has even tried the application "differin." also, we think more are popping up. the main one is on her chin, another is on the side of her face.

HOWW should we get rid of it?