Hi I have a hard lump about 2cms in radius on my upper inner thigh. It feels like a small marble is in my thigh. I only noticed it today yet its already like this. it is very high up my thigh as in right below my underwear line. I have felt a bit of irritation around there before but I thought it was just from wearing tighter underwear. I do horse riding a lot so I'm worried that could irritate it. It's a bit red and kinda sore to touch. It's under the skin. I don't want to show my mom or go to a doctor about it tbh.