I'm a 15 year old female and I have a hard lump under my right nipple. It only hurts when I lay down on my stomach too quickly or whenever a sudden force pushes on it, but it hurts as if I've bruised it or something which I may have because I ran into a wall. I've done some research, but I'm still worried that it may be something serious. I've only had it for about a week, but I haven't had any symptoms, no skin changes, no discharge, no symptoms of sickness. Except for a few days ago I experienced a sort of pain on the right side of my body. I had a headache, I couldn't hold anything with my right hand because it felt weak, and I had an aching pain in my foot. Would any of those symptoms be caused by that lump, or was it just a phase? I apologize for the grammar errors, but please respond as soon as possible.