Sycosis vulgaris

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| synonym = Barber's itch, Sycosis barbae

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| caption = Sycosis vulgaris

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| specialty = Dermatology

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Sycosis vulgaris is a cutaneous condition characterized by a chronic infection of the chin or bearded region.{{cite book |author1=James, William D. |author2=Berger, Timothy G. |title=Andrews' Diseases of the Skin: clinical Dermatology |publisher=Saunders Elsevier |year=2006 |isbn=0-7216-2921-0 |display-authors=etal}}{{rp|252}}{{cite book |author1=Rapini, Ronald P. |author2=Bolognia, Jean L. |author3=Jorizzo, Joseph L. |title=Dermatology: 2-Volume Set (see the picture) |publisher=Mosby |location=St. Louis |year=2007 |isbn=978-1-4160-2999-1 }}

The irritation is caused by a deep infection of hair follicles, often by species of Staphylococcus or Propionibacterium bacteria.{{cite journal|last=Nenoff|first=P|author2=Haustein, UF |author3=Hittel, N |title=Activity of nadifloxacin (OPC-7251) and seven other antimicrobial agents against aerobic and anaerobic Gram-positive bacteria isolated from bacterial skin infections.|journal=Chemotherapy|date=October 2004|volume=50|issue=4|pages=196–201|pmid=15452398|doi=10.1159/000081032}} It usually affects men who shave as this results in bacterial inoculation all over the face. Asymptomatic or painful and tender erythematous papules and pustules may form around coarse hair in the beard (sycosis barbae) or the back of the neck (sycosis nuchae).{{cn|date=May 2021}} In more severe cases, there may be crusting, follicular destruction and scarring.{{cite book | last1=Ashton | first1=Richard|last2=Leppard | first2=Barbara | title=Differential Diagnosis in Dermatology|edition=5th| publisher=CRC Press | date=14 April 2021| isbn=978-0-367-08597-1 | pages=60-61}}