what would a lump on your back near your shoulder be? it is the size of a baseball

Anne, please go to yhe dr immediately it could be as simple as a boil but go to the drPLEASE. marywoo

Ann - just writing to reinforce what Marywoo has written - this is the type of situation where you must go to a doctor as soon as you can get there. We would really like to help, but can't unless you know for sure what you are dealing with.
Can you see a doctor right away?

Paddy

what would a lump on your back near your shoulder be? it is the size of a baseball

I agree, you should see a doctor as soon as possible and have it checked.