WhT the heck is going on with my boob ?!

Ok so my left boob has had this rash under it for a couple months but it went away only to leave an itchy, scaly spot in it's wAke. I've had rashes under my breasts before but none like this. Also my left nipple let a droplet of dark fluid at least twice when squeeZed but not here recently. On multiple occasions though have I had swellings in both armpits for years but idk if that's relevant to this. I'm just concerned because the spot hasn't g on e away and it's in the same spot as the rash and it's been there for a while . What say you guys ?