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"Barber's rash", medically known as folliculitis, is caused when the hair follicles become infected with the bacteria Staphylococcus aureus. This bacterium lives in the nasal passages and can be introduced to the follicles during shaving. The infection leads to redness, itching, and small, pus-filled blisters.
"Razor bumps", medically called pseudofolliculitis barbae, occur when the hair curls and grows back into the skin leading to redness, inflammation and increased susceptibility to infection.