Acne that occurs after shaving is a little different than the common form associated with puberty and the teen years. Acne in general refers to a clog of the hair follicles that leads to red bumps. Ordinarily, this clog forms when dead skin cells and oil pool together to block the follicle opening. The pimples you get after shaving occur because that act of shaving itself irritates the follicles and causes blockage. As with many things, the best cure for acne after shaving is prevention. Proper shaving techniques will reduce irritation and the pimples that go with it.
Splash warm water on your face before beginning to shave. This will open up pores and soften the skin.
Select a shaving cream that provides a thin layer of protection to your skin. According to the website Acne.com, filmier creams will enable the razor to move freely over the skin surface and help reduce irritation. Use the shaving cream liberally when applying.
Use disposable, single-bladed razors. Double-bladed razors actually damage the dermis. When skin grows back, it may clog the follicle and lead to chronic acne. Replace the razor with every shave.
Shave in the same direction as the hair grows. Look at your hair growth before applying shaving cream. Hair grows downward in most cases. To shave with the grain, you stroke the razor in the same direction as hair growth. You will not get as close of a shave this way, but will reduce irritation.
Apply a benzoyl peroxide or salicylic acid gel to face as a toner. This will both medicate the acne to prevent it before it starts, and close pores. As an alternative, try a natural astringent like witch hazel.
Acne.com states the best tool to prevent acne is an electric razor.