Scalp folliculitis shows itself as small, intensely itchy, red bumps on the scalp, according to DermNet NZ. There may be several lesions or only a few, and scratching causes the lesions to become sore and crusted. A severe from of scalp folliculitis, acne necrotica, leaves permanent scars.
WebMD explains that folliculitis is an infection of the hair follicles that can occur on any part of the body with hair. It is most frequently seen on the scalp, face, neck, thighs and groin. Most often caused by bacteria, folliculitis is also caused by yeast and other types of fungus.
Shaving too aggressively or wearing overly tight clothing can irritate hair follicles, ultimately leading to folliculitis. Additionally, sweat and makeup irritate hair follicles and contribute to folliculitis. As WebMD explains, follicles that are injured are more likely to develop folliculitis.
"Hot tub folliculitis," which occurs within 72 hours of using a hot tub or Jacuzzi, can cause pimples on the stomach, arms and legs, as well as a fever. This unique type of folliculitis typically resolves on its own within 10 days, states WebMD.
The use of a medicated shampoo is the common treatment for scalp folliculitis, while prescription antibiotics or antifungal pills are sometimes necessary for severe cases, according to WebMD.