ContentsSynopsisCodesLook ForDiagnostic PearlsDifferential Diagnosis & PitfallsBest TestsManagement PearlsTherapyReferencesView all Images (17)
Trichomycosis axillaris - Skin
Print
Other Resources UpToDate PubMed

Trichomycosis axillaris - Skin

Print Images (17)
Contributors: Renata Prado MD, Whitney A. High MD, JD, MEng, Jeffrey D. Bernhard MD, Noah Craft MD, PhD, Lindy P. Fox MD, Lowell A. Goldsmith MD, MPH, Michael D. Tharp MD
Other Resources UpToDate PubMed

Synopsis

Trichomycosis axillaris is an asymptomatic superficial bacterial infection caused by Corynebacteria. It is relatively common and is the result of bacterial overgrowth, with concretions forming on hair shafts in moist regions of the body. It affects chiefly the hair of the axilla but may, to a lesser extent, involve the pubic hair as well (trichomycosis pubis). Trichomycosis axillaris may affect any age group from puberty through adulthood. The condition appears to affect males more often, likely because many women shave the axillary hair.

Recent evidence suggests that patients with one cutaneous disease process caused by Corynebacteria, such as trichomycosis axillaris, may often have other related and co-incidental disease processes caused by the same bacterial species, such as pitted keratolysis (a Corynebacterial infection of the feet) or erythrasma (a Corynebacterial infection of the intertriginous skin).

Codes

ICD10CM:
A48.8 – Other specified bacterial diseases

SNOMEDCT:
49894005 – Trichomycosis axillaris

Look For

Subscription Required

Diagnostic Pearls

Subscription Required

Differential Diagnosis & Pitfalls

The differential diagnosis of trichomycosis axillaris includes the following:
  • Black piedra and white piedra – a fungal infection consisting of darkly pigmented (black) or lightly pigmented (white) concretions on the hair that are firm (black) or soft and gelatinous (white). The scalp is preferentially involved in piedra, and hair breakage is more common than in trichomycosis axillaris. A KOH examination reveals hyphae.
  • Hair casts – parakeratotic scale that encircles the hair and may be freely moved up and down the shaft. These casts are often found in association with inflammatory conditions, such as seborrheic dermatitis or psoriasis.
  • Pediculosis – pediculosis pubis (the crab louse) may occasionally form nits on the pubic hair that are fixed. Upon microscopic exam, the adult louse is identified on the hairs near the base.

Best Tests

Subscription Required

Management Pearls

Subscription Required

Therapy

Subscription Required

References

Subscription Required

Last Updated: 01/23/2015
Copyright © 2019 VisualDx®. All rights reserved.
Trichomycosis axillaris - Skin
Print 17 Images Filter Images
View all Images (17)
(with subscription)
 Reset
Trichomycosis axillaris : Axilla, Yellow hair
Clinical image of Trichomycosis axillaris
Copyright © 2019 VisualDx®. All rights reserved.