Sometimes "whiteheads" can form, and I've been basically told to pop them by my doctor, although he didn't come right out and "officially" recommend it.

He referred me to an eye specialist, because it was near my eye, but he and a pharmacist suggested that it could be popped, but were careful not to say I should do it, if you know what I mean.

I've always heard that pimples shouldn't be squeezed when I was a kid.