Under boob “pimple”

Was getting into the shower yesterday and noticed this pimple like thing on my right breast. It’s right under the breast, usually where my breast sits. It’s got a purple center and is red around it. It hurts when I touch it…. No lump within my breast tissue but I can feel it almost like what a boil feels like (I get boils a lot)…

Is this something I should be worried about? I breastfeed my 3 year old daily, I’m trying not to touch it but I just want to pop it!! Any input is helpful.