What is the incidence of folliculitis?

Updated: Oct 08, 2020
  • Author: Elizabeth K Satter, MD, MPH; Chief Editor: Dirk M Elston, MD  more...
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Superficial folliculitis is common, but because it is often self-limited and patients rarely present to the doctor; therefore, the exact incidence is unknown. Those who are seen, more often have either recurrent or persistent superficial folliculitis or deep folliculitis. Although the incidence is unknown, conditions that make patients more susceptible include frequent shaving, immunosuppression, preexisting dermatoses, long-term antibiotic use, occlusive clothing and/or occlusive dressings, exposure to hot humid temperatures, diabetes mellitus, obesity, and use of EGF-R inhibitor medications.

Folliculitis has also been reported following smallpox or anthrax vaccine. These cases are more common in military troops who are vaccinated prior to being deployed. [11]

The acneiform eruption attributed to epidermal growth factor receptor inhibitors occurs in 50-100% of patients and is a dose-dependent drug reaction. [7, 8, 9, 10]

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