I have a rash that won’t go away.

Hi, im Josh. Im needing help with something, I have a rash under my nipple. It's been here for about 3-4 months and is quite dormant at the minute, some times it gets itchy and annoying. I've tried looking for answers and even the on the NHS website, it's all coming up with breast cancer in males. Anyone got any suggestions? Thank you :)