Red Skin Spots on Torso?

What does it mean when someone someone has red spots on their torso (front & back, from collar bone to waistline). The spots are reddish, raised, and in the centre go yellowish. They're quite kind of bumpy, but apparently they don't hurt or anything. There's a big one on the person's back which looks like a ring because the yellow bit in the middle is almost skin coloured again. There are about 10 of these things, some cherry-red, some pinkish, only on the torso, not the arms, neck, legs, etc.

The person with them is 19, pretty healthy except they smoke & drink alot.
Does anyone know what these are? Should the sufferer get them checked out?

EDIT: PS it's not me!
EDIT AGAIN: They don't hurt at all, apparently. It was only because I saw them that this person realised there were so many.