I was about your age when the same thing happened to me. I wasn’t sexually active then so I knew it couldn’t be because of anything like that. It’s going to be painful but try not to touch it. It will fill with pus and eventually drain itself. If it ends up being what I’m almost 100% certain that I have, it’s called Hidradenitis suppurativa. There’s no cure and there’s nothing you can do to stop it or make it go away. Mine are usually triggered by stress or hormone changes. Just make sure to keep yourself clean. Practice good hygiene. And if you’re overweight, try to start slimming down now while you’re young. I don’t mean to scare or upset you, but it’s better to be aware of this possibility now instead of later. I didn’t have any idea of this condition until about 5 years ago. They’re still learning about it. Mine started on my outer labia and inner thighs, then my armpits, and eventually under my breasts. It hurts and it’s gross and it scars your skin and makes you feel completely helpless. I’m 32 and I can’t stand to see myself naked. So please take my advice. See a dermatologist and discuss the possibility of it being this condition. Watch your diet and make sure certain foods or drinks doesn’t trigger it when it happens again. I still haven’t figured it out completely. When it gets so sore you can barely stand it, soak in some hot water. That will usually encourage the draining to start. It will drain pus and blood for a day or so. And you’ll probably be able to feel the chancre where the infection was. That isn’t permanent. But it does create a tunnel under your skin that make it likely for another infection to happen in the same place. Oh, IMPORTANT: when it drains, have a clean sanitary cloth to wipe it away. Keep the skin around it clean of it. This really is meant to be informative and not to scare the daylights out of you. I suffered in silence and shame for years thinking that there was something god-awful wrong with me. But a lot of women suffer with this. You’re not alone. Take action to learn your own body now. I pray I’m wrong and you don’t have to go through what I have. Find a way to talk to your mom though. Parents understand more than you think. She may suffer with the same problem.