If you secretly enjoy popping whiteheads or spending your evenings in front of a mirror using a blackhead removal tool, you’re not alone. For many of us, picking our own spots – or watching videos of others having theirs popped, plucked and squeezed – has become a guilty pleasure. So why, when we know picking our skin is bad for us, do we continue to do it? We asked a psychologist to shed some light on this secret phenomenon.