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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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Skin tension lines

What are skin tension lines?Skin tension lines represent a map of the direction in which the tension in the skin...


Chlamydia is a sexually transmitted infection caused by the bacterium Chlamydia trachomatis with the serotypes D-K.

Airborne contact dermatitis

What is airborne contact dermatitis?Airborne contact dermatitis refers to acute and chronic dermatitis of exposed parts of the body, especially...

Compulsive hand washing

What is compulsive hand washing?Patients with compulsive hand washing perform excessive and repetitive washing of their hands in an attempt...

Chronic pruritus of unknown origin

What is chronic pruritus of unknown origin?Chronic pruritus of unknown origin is defined as an itch lasting greater than six...

EB with congenital absence of skin

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What is onychogryphosis?Onychogryphosis, also known as ‘Ram’s horn’ nail, is a form of nail disorder resulting from slow nail plate...

Benzalkonium chloride contact dermatitis

What is benzalkonium chloride?Benzalkonium chloride is a quaternary ammonium cationic detergent.

Chilblain lupus erythematosus

What is chilblain lupus erythematosus?Chilblain lupus erythematosus (LE) is a rare variant of chronic cutaneous LE and was originally described...

Skin Cancer and Self-Exams

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

Hereditary angioedema

What is hereditary angioedema?Hereditary angioedema (HAE) is a familial disease characterised by recurrent attacks of self-limiting oedema that can affect...

Key clinical-trial evidence for risankizumab

IntroductionIn March 2019, risankizumab (trade name SKYRIZI™) received US Food and Drug Administration (FDA) for the treatment of moderate-to-severe plaque...


What is risankizumab?Risankizumab is a biological medicine used for psoriasis, a skin disorder in which skin cells form scaly red...

Hyperbaric oxygen therapy

What is hyperbaric oxygen therapy?Hyperbaric oxygen therapy is a treatment in which a patient breathes pure oxygen while subject to...

Laser therapy in skin of colour

What is skin of colour?Skin of colour refers generally to non-white skin types with a particular emphasis on Fitzpatrick skin...

Blisters and pustules in neonates

IntroductionThis page describes vesiculobullous and pustular lesions in newborns and their differentiating characteristics.

Subacute cutaneous lupus erythematosus

What is subacute cutaneous lupus erythematosus?Subacute cutaneous lupus (SCLE) is a subtype of cutaneous lupus erythematosus.

Colloid milium

What is colloid milium?Colloid milium refers to a group of rare, degenerative, cutaneous deposition disorders.

Annular erythema images

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What is a spondyloarthropathy?Spondyloarthropathy refers to a group of five seronegative inflammatory rheumatic disorders that are related in disease manifestation...

Erythema annulare centrifugum

What is erythema annulare centrifugum?Erythema annulare centrifugum (EAC) is a chronic reactive form of annular erythema characterised by erythematous, circular,...

Tick bite induced red meat allergy

What is tick bite induced red meat allergy?Tick bite induced red meat allergy is an allergy to the carbohydrate galactose-alpha-1,3-galactose...

Ethnic dermatology

What is ethnic dermatology?Ethnic dermatology is an area of interest dedicated to the presentation, diagnosis, and management of skin disorders...

Emollients for eczema

What is an emollient?Emollients are topical moisturising agents used to alleviate itchiness and other discomforts associated with eczema.

Wound cleansers

What are wound cleansers?Wound cleansers are rinsing solutions used to remove foreign materials on a wound surface and its surrounding...

Urticaria in children

What is urticaria in children?Urticaria relates to a group of conditions in which weals (hives) or angioedema (swelling) develop in...

Psychological effects of hair loss

What is hair loss?Hair loss (alopecia) is a common problem that affects up to 50% of men and women throughout...

Splinter haemorrhage

What is a splinter haemorrhage?A splinter haemorrhage is a longitudinal, red-brown haemorrhage under a nail and looks like a wood...

IgE tests

What is immunoglobulin E?Immunoglobulin E (IgE) is an antibody produced during a type I hypersensitivity reaction to an allergen.

Aeroallergens and the skin

What are aeroallergens?Aeroallergens are various airborne substances or inhalants, such as pollens, spores, and other biological or non-biological airborne particles...

Peanut allergy

What is peanut allergy?Peanut allergy is an adverse immune response to a peanut allergen.

Fibroepithelioma of Pinkus

What is fibroepithelioma of Pinkus?Fibroepithelioma of Pinkus, also known as Pinkus tumour and Pinkus epithelioma, is a premalignant fibroepithelial tumour...

Spindle cell melanoma

What is spindle cell melanoma?Spindle cell melanoma is a rare histological variant of melanoma, characterised by the presence of spindle-shaped...

Legius syndrome

What is Legius syndrome?Legius syndrome is a rare genetic disorder that was first described in 2007 [1].

Annular lichenoid dermatitis of youth

What is annular lichenoid dermatitis of youth?Annular lichenoid dermatitis of youth is a rare skin condition that was first described...

Erythema gyratum repens

What is erythema gyratum repens?Erythema gyratum repens is a rare paraneoplastic type of annular erythema with a distinctive figurate ‘wood-grain’...

Chronic spontaneous urticaria

What is urticaria?Urticaria is a condition characterised by the presence of weals (hives) and angioedema [1,2].

Chronic inducible urticaria

Chronic inducible urticaria is chronic urticaria that has an attributable cause or trigger and is classified according to the stimulus...

Periorificial dermatitis in children

What is periorificial dermatitis?Periorificial dermatitis in children typically presents as multiple small papules around the mouth, nose, and eyes.

Naevus simplex

What is naevus simplex?Naevus simplex is a common, benign capillary vascular malformation.

Hypogonadism in males

What is hypogonadism?Hypogonadism describes the inadequate function of the gonads (reproductive glands) leading to impaired production of germ cells and...

Dermatopathology topics

Eruptive xanthoma

IntroductionEruptive 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

IntroductionVerrucous 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

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

Lichenoid drug eruption

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

Sclerosing lipogranuloma

IntroductionSclerosing 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

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

Cutaneous larva migrans

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


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


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

Synovial sarcoma

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

Clear cell fibrous papule

IntroductionClear 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

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


What is measles?Do you have confirmed measles?


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

Fifth disease
Fifth disease

What is erythema infectiosum?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...


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


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

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

What is hand foot and mouth disease?Hand foot and mouth disease (HFM) is a common mild and short-lasting viral infection...

Infantile papular acrodermatitis
Papular acrodermatitis

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

Molluscum contagiosum
Molluscum contagiosum

What is molluscum contagiosum?Molluscum contagiosum is a common viral skin infection of childhood that causes localised clusters of epidermal papules...

Viral warts
VIral warts

What is a viral wart?A viral wart is a very common growth of the skin caused by infection with human...

Head louse
Head lice

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


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

Slider: Childhood infections

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