Chancre

Genital ulcer

Not to be confused with canker sore.

Chancres on the face and hand Chancre on the underside of the penis

A chancre (/ˈʃæŋkər/ SHANG-kər)[1] is a painless genital ulcer most commonly formed during the primary stage of syphilis.[2] This infectious lesion forms around 21 days after the initial exposure to Treponema pallidum, the gram-negative spirochaete bacterium causing syphilis, but can range from 10 to 90 days.[2] Without treatment it may persist for two to six weeks before healing.[2] Chancres transmit syphilis through direct physical contact. These ulcers usually form on or around the anus, mouth, penis and vulva.

Chancres are also associated with the African trypanosomiasis (sleeping sickness), surrounding the area of the tsetse fly bite.[citation needed]

## Similarities with chancroid

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Two chancres on the penile shaft, caused by primary syphilis. Chancres develop at the site of Treponema pallidum inoculation.

Similarities between the conditions chancre and chancroid:[3]

* Both originate as pustules at the site of inoculation, and progress to ulcerated lesions
* Both lesions are typically 1–2 cm in diameter
* Both lesions are caused by sexually transmissible organisms
* Both lesions typically appear on the genitals of infected individuals

## Differences from chancroid

[edit]

Differences between the conditions chancre and chancroid[4] Chancre | Chancroid

|

Caused by Treponema pallidum infection | Caused by Haemophilus ducreyi infection
Typically painless | Typically painful
Typically single lesion | Typically multiple lesions
Regional bilateral lymph node enlargement | Regional unilateral lymph node enlargement
Typically exudes serum | Typically has a grey or yellow purulent exudate
Hard (indurated) base with sloping edges | Soft base with undermined edges
Heals spontaneously within three to six weeks | Requires antibiotic treatment

* Chancres can occur in the pharynx as well as on the genitals. Not to be confused with condylomata lata, which is seen in secondary syphilis.

## Etymology

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The word "chancre" (French pronunciation: [ʃɑ̃kʁ]) means "little ulcer" in Old French. Related to the English "canker", they both come from the Latin cancer, meaning "crab",[5] which is a translation from the Greek word καρκίνος (karkínos), also meaning "crab".[6]

## See also

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* Primary cutaneous histoplasmosis

## References

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1. ^ chancres thefreedictionary[full citation needed]
2. ^ a b c Hook, Edward W. (2012). "Syphilis". Goldman's Cecil Medicine. pp. e157–e163. doi:10.1016/B978-1-4377-1604-7.00569-8. ISBN 978-1-4377-1604-7.
3. ^ "Chancroid". The Lecturio Medical Concept Library. Retrieved 7 July 2021.
4. ^ "What's the Difference Between a Chancre and a Chancroid?". NURX. Retrieved 7 July 2021.
5. ^ medterms.com Archived 2012-08-06 at the Wayback Machine[full citation needed]
6. ^ Ayto, John (1990). Dictionary of Word Origins. New York: Arcade Publishing, Inc. p. 94\. ISBN 1-55970-214-1.

* v
* t
* e

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
* 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|

* Scleroderma/morphea
* Granuloma annulare
* Lichen sclerosis et atrophicus
* Necrobiosis lipoidica

Miscellaneous
disorders|

| Ulcers|

|

Hair|

* Telogen effluvium
* Androgenic alopecia
* 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

* v
* t
* e

Bacterial skin disease

Gram +ve|

| Bacillota|

| 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

Clostridium|

* Gas gangrene
* Dermatitis gangrenosa

Others|

* Listeriosis
* Erysipeloid of Rosenbach
* Mycoplasma

Actinomycetota|

| 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

|

Others|

* Cutaneous actinomycosis
* Nocardiosis
* Cutaneous diphtheria infection
* Arcanobacterium haemolyticum infection
* Group JK corynebacterium sepsis

Gram -ve|

| Pseudomonadota|

| Alpha|

* 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

|

Beta|

* Gonococcemia/Gonorrhea/Primary gonococcal dermatitis
* Melioidosis
* Cutaneous Pasteurella hemolytica infection
* Meningococcemia
* Glanders
* Chromobacteriosis infection

Gamma|

* 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

Campylobacterota|

* Helicobacter cellulitis

Other|

* Syphilid
* Syphilis
* Chancre
* Yaws
* Pinta
* Bejel
* Chlamydia infection
* Leptospirosis
* Rat-bite fever
* Lyme disease
* Lymphogranuloma venereum
* Gram-negative folliculitis
* Gram-negative toe web infection

Unspecified
pathogen|

* Abscess
* Periapical abscess
* Boil/furuncle
* Hospital furunculosis
* Carbuncle
* Cellulitis
* Paronychia / Pyogenic paronychia
* Perianal cellulitis
* Acute lymphadenitis
* Pilonidal cyst
* Pyoderma

* Folliculitis
* Superficial pustular folliculitis
* Sycosis vulgaris
* Pimple
* Ecthyma
* Pitted keratolysis
* Trichomycosis axillaris
* Necrotizing fasciitis
* Gangrene
* Chronic undermining burrowing ulcer
* Fournier gangrene
* Elephantiasis nostras
* Blistering distal dactylitis
* Botryomycosis
* Malakoplakia
* Pyomyositis
* Blastomycosis-like pyoderma
* Bullous impetigo
* Chronic lymphangitis
* Recurrent toxin-mediated perineal erythema
* Tick-borne lymphadenopathy
* Tropical ulcer

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