Leaking from armpit

Claire

This is slightly embarrassing but during my pregnancy I noticed a dark what looked like a tiny stretch mark on my armpit I figured was just hyper pigmentation. Well I had my baby on the 6th and my armpit swelled up and the "stretch mark" started leaking milk today... has anyone else had this and how long did it last. Doc said its normal when I called and said I have a pittie but didn't say when it would go away 😭