Should I be concerned?

I noticed this yesterday when I was going to shower, it on the side of my breast. It looked like a regular mosquito bite and felt like one too. I left it alone, didn't want to cause it to itch. Well today when i went to shower i looked at it and thought it must be a ingrown hair (i tend to get ingrowns around my breast). Thought it was a weird place to have a mosquito bite anyways so i tried to pop it out. Well it didn't but it sorta spread. Yesterday it was just a small red spot and now that i tried to pop it like a pimple it spread like this and has specks of blood. Now i know it's not an ingrown hair nor a mosquito bite so what do you think? It's not a hickey