Hi doc! My 19 month old son has a small whitehead type pimple on his wrist . At first it had a small speck of black in the center, now that s gone. It was pretty red, the skin area around the pimple, maybe infection? That seems to have subsided a bit too. My worry is the black speck, and also that he had another one exactly like this on his thumb about a month ago. My hubby popped that one, kinda, because we thought it was a splinter that never came out, (bc of black speck). We haven t messed with this one and it seems to be going away, but what is this?? What could it be?