Painful bump,

I’ve had what I think is a cyst on my inner thigh area for 2 months. It started off small but it keeps getting bigger and bigger and I haven’t been to the doctor because idk whether to see a dermatologist or and obgyn, because well I’ve never been to either. I don’t know which one I should go to and my mom is no help. She just judges me. But it is super painful and it’s unbearable because my panty line rubs against it and it’s getting hard to walk. Please help.