I have a lump in my left armpit, only about the size of like a bad bug bite, but it's rather sore and painful. As far as I can tell, I haven't changed anything in my routine; no new products or environments that I've used or visited. And, though my skin is generally sensitive, I have no allergies. I've always been told to check for lumps around my breast and underarms, because of cancer. But I'd always thought that a cancerous lump would be located in the deep tissue or something, not on the surface of my skin.
I'm 18, so I know the chances of it actually being any sort of cancer are probably slim to none, but there is a history of it in my family. I'm in good health and a vegetarian (don't eat beef, pork, fish, or poultry, but I do eat eggs and dairy products). Also, though I doubt it's relative, I've had a continuous headache for over three days now, but no other symptoms.