I have a soft bump on my arm?
I'm 14 years old and today I randomly felt a bump on my right arm. It's the size of a dollar coin I would say. I wouldn't necessarily say it hurts. Only it feels odd when I extend my arm or press it. I haven't hit my arm at all today so I doubt it's swollen. I sort of freaked out because my friend said her cousin had the same thing on his shoulder and it was a tumor. My grandmother (father's mom) had a tumor and I think I was cancer and it was in her brain and she passed away from it. Any advice or information would help!