I have this rash on the back of my neck. At first it looked like I had dirt on the back of my neck. As I also have it on my armpits and in the middle of my breast area but the doctor said that was caused by my disease, PCOS. It has now turned into a painful skin breakage rash... I have been putting Clotrimazole on it and it was working, now on my left side of my neck (back side) there is a hole that leaks out blood and smelly pus. What could this possibly be? I know it s not a cyst. If you could please help me or recommend some kind of medicine or cream that would be great. Thank you.