What are They?

So about a month ago I found an identical bump just like these under my right breast. It was extremely painful and I thought it was a pimple (still could be) but it has been a month and its left an almost bruise like scar. Due to chafing, I had just gotten out of the shower and was moisturizing said chafe (between my thighs, toward my anus) I felt these, at first I thought they were deep stretch marks (something I have many of). Since it was right on the inside of my thigh close to the chafe where I couldn't feel, I took this picture, they look the exact same to what was on the underside of my right breast. These ones don't hurt (besides the chafe). Does this have something to do with the chafe? Are they pimples? Where I live we have had extreme weather changes from being in the 60's to being below freezing, could that even be a factor? I really don't know and I'm concerned.