Hi, I'm 17 years old, and I've recently found a lump in my armpit. I've had a few before which were just pimples that were forming, but this feels a bit stranger than normal. I am female, and I am on birth control (combined pill), so I am very weary about it being a cancer. It is quite under the skin and doesn't really even reach the surface when I lift my armpit to stretch the skin, and neither is it noticeable - I only realised it was there when I felt my armpit. I'm not sure if it's irregular in shape because of where it's located. I am also unaware of when this appeared. Should I be worried? I really am, but I think my GP is just going to brush it off regardless of if it is cancer. Does anyone have any advice on what to do? Just for context, I have been feeling extremely fatigued but I was prescribed vitamin D, and I do have irregular bowel movement, but this has been going on for quite a while.