Pimple

A pimple is a result of a blockage of the skin's pore
Causes
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 a 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 various bacteria including the species Propionibacterium acnes. Pimples can often be caused by stress.
Treatment
See also: Acne vulgaris#Treatments
Keeping Skin Clean
Washing your skin regularly cleanses your pores, which helps with the prevention of pimples.
Over-the-counter medications
Common over-the-counter medications for pimples are benzoyl peroxide and/or salicylic acid. Both medications can be found in many creams and gels used to treat acne through topical application. Both medications help skin slough off more easily, which helps to remove bacteria faster. A regimen of keeping the affected skin area clean plus the regular application of these topical medications is usually enough to keep acne under control, if not at bay altogether. 1-2% of the population is allergic to benzoyl peroxide treatments.

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