I've had inflammatory acne for a few months, mainly pustules, now I'm on antibiotics (clindamycin). A few weeks ago I got a small, flat, red thing on my cheek. It was about the size of a papule, but seemed shinier. It didn't hurt at all though. It lasted a couple weeks, seemed to dry up, and then I kinda rubbed it off, maybe too early. It left a small dent in my cheek and I was shocked because my papules never leave dents. Is this the beginning of cystic acne? I'm so scared. Do antibiotics have any effect against cystic acne?