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To make authoritative information about the skin available to anyone in the world with an internet connection.

DermNet NZ was launched in 1996 by a group of Dermatologists from New Zealand. It has become a world-renowned resource of skin disease information. 

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Macular amyloidosis

Macular amyloidosis is one of three forms of primary localised cutaneous amyloidosis.

Cannabinoids in dermatology

Cannabis refers to one of two notable subspecies of the cannabis plant.

Immune reconstitution inflammatory syndrome

Immune reconstitution inflammatory syndrome (IRIS) usually describes the paradoxical worsening of pre-existing infectious processes after the initiation of antiretroviral therapy...

Fragrances and perfumes

A fragrance is defined as a combination of organic compounds that produces a distinct smell or odour.

Radiographic investigations in melanoma

Radiographic investigations produce images of tissues and bones under the skin.

Pharmacogenomics in dermatology

Pharmacogenomics aims to provide an understanding of how a patient’s whole genome influences their individual response to therapeutics.

Naevus lipomatosus superficialis

Naevus lipomatosus superficialis is a developmental malformation (a cutaneous hamartoma or type of birthmark).

Sturge–Weber syndrome

Sturge–Weber syndrome is a rare, congenital, and non-inherited vascular disorder characterised by capillary malformation on the facial skin (port-wine stain)...

Lax beetle dermatosis

Lax beetles are common insects that are found worldwide, belonging to the family Oedemeridae [1–3].

Idiopathic eruptive macular hyperpigmentation

Idiopathic eruptive macular hyperpigmentation is a rare benign pigmentary disorder characterised by asymptomatic hyperpigmented macules with a predilection for the...

Acquired dermal macular hyperpigmentation

Acquired dermal macular hyperpigmentation comprises three conditions: Erythema dyschromicum perstans Lichen planus pigmentosus Idiopathic eruptive macular hyperpigmentation [1,2].

Eczema coxsackium

Eczema coxsackium is an enteroviral infection affecting children with atopic dermatitis (eczema).

Reactive arthropathy

Reactive arthropathy describes the inflammation of joints following an infection usually involving the gastrointestinal or urogenital tracts [1–3].

Cutaneous adverse effects of antimelanoma therapies

The introduction of targeted cancer therapies and immunotherapy has revolutionised the management and prognosis of metastatic melanoma, significantly improving drug...

Interferon regulatory factor 4 gene

The physical features of hair, skin, and eye colour, freckling, melanocytic naevi and the skin’s response to the sun are...

Inflammasomes and inflammatory skin diseases

The innate immune response refers to the parts of the immune system that are immediately functional.

Calcipotriol/betamethasone dipropionate ointment and gel

Psoriasis is an autoimmune skin disorder characterised by circumscribed, red, scaly plaques.

Idiopathic guttate hypomelanosis dermoscopy

Idiopathic guttate hypomelanosis is a commonly acquired leukoderma characterised by flat porcelain-white macules on sun-exposed areas.

Perpendicular white lines dermoscopy

In dermoscopy, perpendicular white lines are short discrete white lines oriented parallel and orthogonal (perpendicular) to each other and seen...

Hair shedding

Hair shedding is a normal part of the hair cycle and is an ongoing process.

Adjuvant therapies for malignant melanoma

Adjuvant therapy is defined as a treatment given after the initial therapy.

Aquagenic urticaria

Aquagenic urticaria is a rare variant of chronic inducible urticaria that occurs in response to contact with water [1,2].

Auriculotemporal syndrome

The auriculotemporal syndrome is characterised by sweating, flushing, and warming over the preauricular area (the front of the ear) and...

Histiocytic necrotising lymphadenitis

Histiocytic necrotising lymphadenitis is a benign condition associated with lymphadenopathy (a disease of the lymph nodes; in this case, usually...

Multicentric reticulohistiocytosis

Multicentric reticulohistiocytosis is a very rare systemic granulomatous disease classified as a reticulocytosis and proliferative non-Langerhans cell histiocytosis.

Diffuse alopecia

Alopecia is the medical term for hair loss.

Genetic testing for melanoma

Genes carry information in the form of DNA and control how cells function.

Nail disorder images

Nail disorders include acral lentiginous melanoma of the nail unit.

Dermoscopy of vitiligo

Vitiligo is a common acquired depigmentation of the skin due to autoimmune destruction of melanocytes.

Leishmaniasis images

Leishmaniasis is a parasite carried by sandflies.

Paedarus dermatitis

Paedarus dermatitis is a skin irritation due to contact with certain species of the rove beetle, such as the Nairobi...

Terra firma-forme dermatosis

Terra firma-forme dermatosis is a benign skin disorder that manifests as raised, dirty-appearing areas of skin.

Semen contact allergy

Semen contact allergy is a rare but notable form of allergic contact urticaria that occurs during or after contact with...

Bullous systemic lupus erythematosus

Bullous systemic lupus erythematosus (SLE) is an autoimmune subepidermal blistering disease that occurs in patients with SLE.

Key clinical-trial evidence for calcipotriol/betamethasone dipropionate foam

Calcipotriol/betamethasone dipropionate foam (trade name Enstilar®) is a dual-action investigational aerosol foam containing calcipotriol, a vitamin D analog, and betamethasone...

Calcipotriol/betamethasone dipropionate foam

Psoriasis is an autoimmune skin disorder characterised by circumscribed, red, scaly plaques.

Cutaneous adverse reactions to calcineurin inhibitors

Calcineurin inhibitors are drugs that work by inhibiting the calcium-dependent protein phosphatase calcineurin, an enzyme that results in activation of...

Incontinence-associated dermatitis

Incontinence-associated dermatitis is a form of irritant contact dermatitis due to contact with urine and faeces in people who are...

Epstein–Barr virus-associated lymphoproliferative disorders

Epstein–Barr virus (EBV), also known as human herpesvirus 4 (HHV-4), is one of the eight known lymphotropic herpesviruses [1].

Skin Cancer and Self-Exams

Sponsored content: melanomas are notoriously difficult to discover and diagnose.

Dermatopathology topics

Eruptive xanthoma

Eruptive xanthoma presents as crops of pink papules which are often pruritic.

Juvenile xanthogranuloma

Juvenile xanthogranuloma usually presents in younger individuals as smooth pink or yellow nodules.

Verrucous haemangioma

Verrucous haemangioma presents as blue-red, vascular papules, plaques or nodules, which later become warty in appearance.


Myiasis is infestation by the larvae of fly species within the arthropod order Diptera (the adult flies are two-winged).

Systemic amyloidosis

Systemic amyloidosis caused by the buildup of amyloid in various organs.

Lichenoid drug eruption

Lichenoid drug reactions are induced by a medication or another exogenous source which can mimic other lichenoid dermatoses clinically and...

Sclerosing lipogranuloma

Sclerosing lipogranuloma usually presents as a painless or slightly tender, indurated mass on the penis, scrotum, spermatic cord and perineum.

Glomeruloid haemangioma

Glomeruloid haemangioma is a rare benign cutaneous vascular proliferation that typically arises in patients with a history of POEMS syndrome.


Splenosis may present in the skin following splenic trauma and subsequent spread of benign splenic tissue into surrounding structures.

Epithelioid haemangioma

Epithelioid hemangioma is a benign vascular lesion of the skin or deeper structures (bone).

Cutaneous larva migrans

Cutaneous larva migrans is a parasitic skin infection caused by helminth larvae that usually infest cats, dogs and other animals.


Mesothelioma is a malignant tumour arises from mesothelial lining of pleura, peritoneum, pericardium and tunica vaginalis — pleural mesothelioma is...


Chickenpox is caused by primary infection with the varicella-zoster virus, of the Herpesviridae family.

Synovial sarcoma

Synovial sarcoma is usually an aggressive deep seated mass presenting around large joints (80% in knee and ankle) in young...

Clear cell fibrous papule

Clear cell fibrous papule is a rare variant of fibrous papule that has a clinical presentation identical to conventional fibrous...

Childhood infections

Meningococcal petechiae
Meningococcal disease

Meningococcal disease is an illness caused by the bacteria Neisseria meningitidis.


Measles is a highly contagious viral infection causing fever and a rash. Early symptoms are like the common cold, with...


Chickenpox is a highly contagious viral infection that causes an acute fever and blistered rash, mainly in children.

Fifth disease
Fifth disease

Erythema infectiosum is a common childhood infection causing a slapped cheek appearance and a rash.

Herald patch: pityriasis rosea
Pityriasis rosea

Pityriasis rosea is a viral rash which lasts about 6–12 weeks. It is characterised by a herald patch followed by...


Impetigo is a common acute superficial bacterial skin infection (pyoderma).


A boil (also called a furuncle) is a deep form of bacterial folliculitis (infection of a hair follicle).

Vesicles on palm in hand foot and mouth disease
Hand foot and mouth disease

Hand foot and mouth disease (HFM) is a common mild and short-lasting viral infection most often affecting young children.

Infantile papular acrodermatitis
Papular acrodermatitis

Papular acrodermatitis of childhood is a characteristic response of the skin to viral infection in which there is a papular...

Molluscum contagiosum
Molluscum contagiosum

Molluscum contagiosum is a common viral skin infection of childhood that causes localised clusters of epidermal papules called mollusca.

Viral warts
VIral warts

A viral wart is a very common growth of the skin caused by infection with human papillomavirus (HPV).

Head louse
Head lice

Head lice are small, wingless insects that infest the human scalp.


Scabies is a very itchy rash caused by a parasitic mite that burrows in the skin surface.

Slider: Childhood infections

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