Spots/ Blemishes/ Pimples, whatever you call them, help!

Recently, (over the past 2-3) weeks I've been getting so many spots on top lip and mouth. I don't have loads of dairy and my skin's just not been great. Any suggestions on what could trigger this. Also my period hasn't come this month again😑like it did 2 months ago, but it came last month. I'm 15 and there is no possible way I could be pregnant (sorry just thought I should include that)