Nipple pain but not pregnant? Remedies?

So basically I’ve been having sharp nipple pain, mostly in the right nipple, for like 3 days now. I can see a red ring around the the very tip of it that looks like irritated skin, but not super sure why it’s happening?

I don’t wear bras very often and have some shirts that have kind of a coarse texture so I’m wondering if that could be it, because when it started hurting I hadn’t worn a bra for like over a week.

I also just started a combination birth control pill while simultaneously on the implant. I have eczema on my arms so I’m just sure if this is just another skin reaction or what.

Remedies?