Does anyone know what this is? It's under my breast. And no it's not a Hickey. It's kinda sore

Maybe from a tight fitted sports bra? Idk just guessing, get better soon @madisonmommy318

It’s a yeast infection. Put some jock itch under there.

I get it too.

It could be from bra and heat plus rubbing...

Same thing my daughter has behing her knee. She's getting treated for yeast

It's a fungal rash, use cortisone on it and whenever you shower, make sure you pat dry under your boobs don't rub dry.

That's a heat rash hun

Try some corn starch