What could this skin condition be ?

[Tony20161999]

For about 4 years now I've had these very small raises in my skin all over my body and they come and go . They don't itch or anything . They don't spread to anyone . They are a little lighter than my own skin tone . They are very much less than half a centimeter in diameter. They have appeared on my chest, arms , legs and inner thighs. I've popped a few and just a dot a blood comes out and it's gone but there are a lot . They are also painless.