Pain in boob by armpit

id

I’m breastfeeding my 1 year old and have an established supply? I guess idk, I don’t have to pump or anything just feed on demand, usually when she’s going to sleep.

Anyways the past 2 days I’ve been feeling this random sharp pain on the side of my boob by my armpit. I don’t feel any bumps or lumps or anything to even indicate mastitis or a clogged duct.

Any suggestions?

Would sunflower letchin help?