Whitlow

This article is about infection of the tip of the finger. For infection at the side or base of the fingernail, see paronychia. For other uses, see whitlow (disambiguation).

Whitlow
An infection of the pulp space
Classification and external resources
ICD-9-CM	681.01

A whitlow or felon is an infection of the tip of the finger.^[1]^[2]^{[lower-alpha 1]} Herpetic whitlow and melanotic whitlow are subtypes that are not synonymous with the term felon. A felon is an "extremely painful abscess on the palmar aspect of the fingertip".^[6] Whitlow usually refers to herpetic whitlow, though it can also refer to melanotic whitlow,^[7] which somewhat resembles acral lentiginous melanoma. The terms whitlow and felon are also sometimes misapplied to paronychia, which is an infection of the tissue at the side or base of the nail. Felon presents with a throbbing-like pain, clinically.

An infection of the pulp space of the thumb

Notes

↑ The term whitlow derives from the Scandinavian whickflaw, combining a variant of quick (a sensitive spot) and flaw.^[3]^[4] Felon comes from the Old French, derived from the Latin root fel-, literally meaning "bile" and referring to the toxic content of the abscess.^[5]

References

↑ "whitlow" at Dorland's Medical Dictionary
↑ Fitzpatrick, Thomas B.; Klauss Wolff; Wolff, Klaus Dieter; Johnson, Richard R.; Suurmond, Dick; Richard Suurmond (2005). Fitzpatrick's color atlas and synopsis of clinical dermatology. McGraw-Hill Medical Pub. Division. ISBN 0-07-144019-4.
↑ Walter William Skeat (1895). A Concise Etymological Dictionary of the English Language. Harper & Bros. pp. 560–. Retrieved March 5, 2013.
↑ ²flaw and ²quick from "Free Dictionary". Merriam-Webster. Retrieved March 5, 2013.
↑ Diab, Mohammad (1999). Lexicon of Orthopaedic Etymology. Taylor & Francis. p. 115. ISBN 978-90-5702-597-6. Retrieved March 6, 2013.
↑ Dorland's Medical Dictionary: 29th Edition.
↑ Haneke E, Baran R (June 2001). "Longitudinal melanonychia". Dermatol Surg 27 (6): 580–4. doi:10.1111/j.1524-4725.2001.01916.x. PMID 11442597.

Diseases of the skin and appendages by morphology

Growths

Epidermal	wart callus seborrheic keratosis acrochordon molluscum contagiosum actinic keratosis squamous-cell carcinoma basal-cell carcinoma Merkel-cell carcinoma nevus sebaceous trichoepithelioma

Pigmented	Freckles lentigo melasma nevus melanoma

Dermal and subcutaneous	epidermal inclusion cyst hemangioma dermatofibroma (benign fibrous histiocytoma) keloid lipoma neurofibroma xanthoma Kaposi's sarcoma infantile digital fibromatosis granular cell tumor leiomyoma lymphangioma circumscriptum myxoid cyst

Rashes

With
epidermal
involvement

Eczematous	contact dermatitis atopic dermatitis seborrheic dermatitis stasis dermatitis lichen simplex chronicus Darier's disease glucagonoma syndrome langerhans cell histiocytosis lichen sclerosus pemphigus foliaceus Wiskott–Aldrich syndrome Zinc deficiency

Scaling	psoriasis tinea (corporis cruris pedis manuum faciei) pityriasis rosea secondary syphilis mycosis fungoides systemic lupus erythematosus pityriasis rubra pilaris parapsoriasis ichthyosis

Blistering	herpes simplex herpes zoster varicella bullous impetigo acute contact dermatitis pemphigus vulgaris bullous pemphigoid dermatitis herpetiformis porphyria cutanea tarda epidermolysis bullosa simplex

Papular	scabies insect bite reactions lichen planus miliaria keratosis pilaris lichen spinulosus transient acantholytic dermatosis lichen nitidus pityriasis lichenoides et varioliformis acuta

Pustular	acne vulgaris acne rosacea folliculitis impetigo candidiasis gonococcemia dermatophyte coccidioidomycosis subcorneal pustular dermatosis

Hypopigmented	tinea versicolor vitiligo pityriasis alba postinflammatory hyperpigmentation tuberous sclerosis idiopathic guttate hypomelanosis leprosy hypopigmented mycosis fungoides

Without
epidermal
involvement

Red

Blanchable
Erythema

Generalized	drug eruptions viral exanthems toxic erythema systemic lupus erythematosus

Localized	cellulitis abscess boil erythema nodosum carcinoid syndrome fixed drug eruption

Specialized	urticaria erythema (multiforme migrans gyratum repens annulare centrifugum ab igne)

Nonblanchable
Purpura

Macular	thrombocytopenic purpura actinic/solar purpura

Papular	disseminated intravascular coagulation vasculitis

Indurated

Miscellaneous
disorders

Ulcers

Hair	telogen effluvium androgenic alopecia trichotillomania alopecia areata systemic lupus erythematosus tinea capitis loose anagen syndrome lichen planopilaris folliculitis decalvans acne keloidalis nuchae

Nail	onychomycosis psoriasis paronychia ingrown nail

Mucous membrane	Aphthous stomatitis oral candidiasis lichen planus leukoplakia pemphigus vulgaris mucous membrane pemphigoid cicatricial pemphigoid herpesvirus coxsackievirus syphilis systemic histoplasmosis squamous-cell carcinoma

Bacterial skin disease (L00–L08, 680–686)

Gram +ve

Firmicutes	Staphylococcus Staphylococcal scalded skin syndrome Impetigo Toxic shock syndrome Streptococcus Impetigo Cutaneous group B streptococcal infection Streptococcal intertrigo Cutaneous Streptococcus iniae infection Erysipelas / Chronic recurrent erysipelas Scarlet fever Corynebacterium Erythrasma Listeriosis Clostridium Gas gangrene Dermatitis gangrenosa Mycoplasma Erysipeloid of Rosenbach

Actinobacteria	Mycobacterium-related: Aquarium granuloma Borderline lepromatous leprosy Borderline leprosy Borderline tuberculoid leprosy Buruli ulcer Erythema induratum Histoid leprosy Lepromatous leprosy Leprosy Lichen scrofulosorum Lupus vulgaris Miliary tuberculosis Mycobacterium avium-intracellulare complex infection Mycobacterium haemophilum infection Mycobacterium kansasii infection Papulonecrotic tuberculid Primary inoculation tuberculosis Rapid growing mycobacterium infection Scrofuloderma Tuberculosis cutis orificialis Tuberculosis verrucosa cutis Tuberculous cellulitis Tuberculous gumma Tuberculoid leprosy Cutaneous actinomycosis Nocardiosis Cutaneous diphtheria infection Arcanobacterium haemolyticum infection Group JK corynebacterium sepsis

Gram -ve

Proteobacteria	α: Endemic typhus Epidemic typhus Scrub typhus North Asian tick typhus Queensland tick typhus Flying squirrel typhus Trench fever Bacillary angiomatosis African tick bite fever American tick bite fever Rickettsia aeschlimannii infection Rickettsialpox Rocky Mountain spotted fever Human granulocytotropic anaplasmosis Human monocytotropic ehrlichiosis Flea-borne spotted fever Japanese spotted fever Mediterranean spotted fever Flinders Island spotted fever Verruga peruana Brill–Zinsser disease Brucellosis Cat-scratch disease Oroya fever Ehrlichiosis ewingii infection β: Gonococcemia/Gonorrhea/Primary gonococcal dermatitis Melioidosis Cutaneous Pasteurella hemolytica infection Meningococcemia Glanders Chromobacteriosis infection γ: Pasteurellosis Tularemia Vibrio vulnificus Rhinoscleroma Haemophilus influenzae cellulitis Pseudomonal pyoderma / Pseudomonas hot-foot syndrome / Hot tub folliculitis / Ecthyma gangrenosum / Green nail syndrome Q fever Salmonellosis Shigellosis Plague Granuloma inguinale Chancroid Aeromonas infection ε: Helicobacter cellulitis

Other	Syphilid Syphilis Chancre Yaws Pinta Bejel Chlamydia infection Leptospirosis Rat-bite fever Lyme disease Lymphogranuloma venereum

Unspecified
pathogen

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