Teen Help Watch
I suggest you go and see a doctor.
It isn’t either a cyst that is developing quickly (usually this isn’t anything serious) or it could be a malignant tumour. I recommend you get this checked out as soon as you can to avoid it from developing further.
My nipple on my left is hardening and u can almost feel like a ball ?? It can move. And recently yellowish light liquid is comming out when I squeeze is. What’s wrong with me ?? I’m 14
If you are concerned ask your parent to make you a doctor's appointment.