How are you doing? Were you able to get to a doctor? Hope you are getting better!
At 16, I'm sure the last thing you want to do is mention this to your parents and ask them to take you to a doctor, but that's what I would recommend doing- it could be a yeast or bacteria causing it- or just simply something like dry skin. When you have a skin condition that creeps up all the sudden and gets worse, it's always best to see a doctor to confirm what is going on.