What causes folliculitis?

Updated: Oct 08, 2020
  • Author: Elizabeth K Satter, MD, MPH; Chief Editor: Dirk M Elston, MD  more...
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Answer

The most common causes of folliculitis include infection (bacterial, fungal, viral, and parasitic), friction and other causes of follicular trauma, occlusion, and drug induced; however, many cases remain idiopathic. Predisposing factors include an altered immune status, prior skin injury, staphylococcal carrier status, malnutrition, diabetes, obesity, occlusion with topical product use, use of certain medications (topical and systemic steroids, lithium, contraceptive agents, testosterone, danazol, stanozolol, antiepileptics, ethionamide, isoniazid, rifampicin, cyclosporin, epidermal growth factor receptor inhibitors, and long-term use of antibiotics), poorly chlorinated hot tubs, and actinic damage. [4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30]


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