Hi , I've just started taking progesterone pills that my doctor prescribed me to take , took make my very young irregular periods , regular.

Everything has been going well , until now , it's the second month and I have my period , I noticed that I've developed 3 pimples on my armpit, upper inner arm , and just at the side of my breast (not on it just near the side of it )

2 of them have become less inflamed or irritating

But the one on the side of my breast is still there

Should I be worried about this?