I have 2 raised bumps on my back...one is bigger than the other and they are greenish/blue and that color appears to underneath the skin. I also have one that isn't raised on my arm that is greenish/blue. I've had the one on my arm for as long as I can remember. But..the ones on my back..I haven't been paying attention. What are they?!?! My dad has something similar on his back..but they are open bumps with something inside of them that's black and raised like a sesame seed.....what is it?.....He said he was born with it...I don't know..how do I get rid of it?

First of all go and get checked by your DR because now a days you never know what they will find out and second take your dad too ex specially if you develop fevers or chills or anything else and even if you don't have a screening done for skin cancer. It is to the Dermatologist with you!