I have had bumps on my shoulders for a long time, since puberty. They look like little tiny pimples under the skin and they can look red in color sometimes..they nickname it "chicken skin" cause it resembles the look of a chicken whose had its feathers pulled out..
You could try googling Keretosis in google images and see if it looks like what your talking about.
If it is..be aware that it doesnt go away. Exfoliating helps but it doesnt remove it. Its often hereditary and either your mom or your dad would have it as well. Its very common in fair skinned people. Its really just harmless..
I'd see a dermatologist, there's any number of harmless things it could be, but nobody on the Internet is going to make a reliable diagnosis like a trained professional with eyes on you and your history can.
Bumps?
