They could be nothing. Or they could be cause for concern. The body develops all sorts of growths on the skin; some of them are benign, some need attention. Rather than depending on a bunch of people you don't know trying to advise you on the basis on a blurry photograph, you really ought to consult a dermatologist. They look at these growths all the time and are much better at appraising them than people on a message board like this. The chances are that the bumps are completely harmless but again, I really suggest you consult a professional.