So what causes us to form pimples?
Pimples can be caused by any number of things including poor hygiene;
According to WikiPedia, "Inside the pore are sebaceous glands which produce sebum. When the outer layers of skin shed (as they do continuously), the dead skin cells left behind may become 'glued' together by the sebum. This causes the blockage in the pore, especially when the skin becomes thicker at puberty. The sebaceous glands produce more sebum which builds up behind the blockage, and this sebum harbours variousbacteria including the species Propionibacterium acnes, causing infection and inflammation."
And when poor hygiene gets out of control, you end up with this monstrosity:
CAUTION: THIS VIDEO IS NOT FOR THOSE WITH WEAK STOMACHS. NSFW & NSFL