Summary
Definition
History and exam
Key diagnostic factors
- presence of risk factors
- scaling scalp lesions
- patchy alopecia
- erythematous, scaling skin lesions with central clearing
- erythematous, scaling rash with follicular pustules in beard or moustache
- erythematous, annular patches on face
- vesicles and scaling of hands
- fissuring, maceration, and scaling in the interdigital spaces of the fourth and fifth toes
- chronically scaly, hyperkeratotic plantar skin with erythema of the soles, heels, and sides of the feet
- folliculitis with nodules
Other diagnostic factors
- thickened nail with subungual hyperkeratosis, onycholysis, and white-yellow to brown discoloration
- small, white speckled patches on the surface of the nail plate with crumbling nail
- lymphadenopathy
- black-dot alopecia
- milky white nail plate
- area of leukonychia in the proximal nail plate
Risk factors
- exposure to infected people, animals, or soil
- exposure to fomites, including hat, combs, hairbrushes, and upholstery
- chronic topical or oral corticosteroid use
- HIV
- diabetes mellitus and other metabolic disorders
- occlusive clothing
- hot, humid weather
- obesity
- hyperhidrosis
- frequenting public bathing areas while barefoot
- deformities of the feet
- recurrent trauma to the skin
- contact sports
- atopic dermatitis
- positive family history
- peripheral vascular disease
Diagnostic investigations
Investigations to consider
- dermoscopy
- fungal culture
- polymerase chain reaction (PCR)
- Wood lamp examination (ultraviolet light)
Treatment algorithm
Contributors
Authors
Antonella Tosti, MD
Professor of Clinical Dermatology
Dermatology and Cutaneous Surgery
University of Miami Health System
FL
Disclosures
AT received honorarium and travel reimbursement from Valeant, PharmaDerm, and Polichem, is on the speaker bureau for PharmaDerm, and is a consultant for Erchonia Laser and Almirall.
Acknowledgements
Dr Antonella Tosti would like to gratefully acknowledge Dr Keira L. Barr and Dr Barry L. Hainer, the previous contributors to this topic.
Disclosures
KLB declares that she has no competing interests. BLH is on the speaker bureaus for the vaccine programmes of Merck and Sanofi-Pasteur pharmaceutical companies.
Peer reviewers
Nanette Silverberg, MD
Clinical Professor of Dermatology
Columbia University College of Physicians and Surgeons
New York City
NY
Disclosures
NS declares that she has no competing interests.
Christina M. Gelbard, MD
Department of Dermatology
UT Dermatology
Health Science Center of Houston
Houston
TX
Disclosures
CMG declares that she has no competing interests.
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