They could be cysts or even large acne that are underneth the skin. Cysts won't be related to your aas use but rather are very common. I had 2 removed several years ago, one on my stomach and one on my back. Very routine procedure. Neither one had to be removed, it was just me that wanted them out. They will biopsy them just in case. Are you sweating a lot on this cycle?? You could try showering couple times a day and even washing the area even more to see if they are acne related. Any questions on cysts just ask, and we will try to help you if we can. Your dermatologist will know right away when they examine them.