yugokid

I am just wondering, on and off for 2 weeks my arm pits have been tender to the touch and if i raise my arm. Now i was wondering what that meant, i guess it means im getting sick, but is it serious? i feel a bump dead center of my arm pit on my skin and its wierd, just wondering is it a fluke or what.

also i can actually grab the "bump" too and lift it but its small

i did some sit ups and i use my arms and a lever and i stress both arms a lot, i also lift heavy things at work...