Hello, I am 24 and worried I may have a cancerous lump to the right side of my breast on the outer side just before the soft breast tissue. I am constantly checking my breasts as my mother was diagnosed with breast cancer last year and I have very high anxiety I will get it so I'm not sure if it's just in my head. I'm also not sure if it's a muscle or something harmless as I can't feel an exact lump more of a swelling but I can't feel the same thing on my left breast, it also feels more prominent when my arm is down and I can't really feel anything when it is raised. I am worried sick though so any advice would be greatly appreciated!