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

DermNet NZ was founded 23 years ago by a group of Dermatologists from New Zealand. It has become a world-renowned resource of skin disease information. 

Recently added pages

Erythema gyratum repens

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

6 January 2019

Chronic spontaneous urticaria

Urticaria is a condition characterised by the presence of hives/weals (also spelt wheals) and/or angioedema [1,2].

20 January 2019

Chronic inducible urticaria

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

20 January 2019

Periorificial dermatitis in children

Periorificial dermatitis in children typically presents as multiple small papules around the mouth, nose and eyes.While the name is suggestive...

14 January 2019

Naevus simplex

Naevus simplex is a common, benign capillary vascular malformation.

6 January 2019

Hypogonadism in males

Hypogonadism describes the inadequate function of the gonads with impaired production of germ cells and sex hormones. What is hypogonadism in males?Hypogonadism...

22 January 2019

Keratolytic winter erythema

Keratolytic winter erythema is a rare inherited skin disorder characterised by recurrent palmoplantar erythema and peeling that is often worse...

6 January 2019

Giant cell arteritis

Giant cell arteritis is a form of vasculitis that most commonly affects the arteries of the scalp and head when...

6 January 2019

Key clinical-trial evidence for cemiplimab

Clinical trials have demonstrated that cemiplimab is effective in patients with advanced cutaneous squamous cell carcinoma (SCC).

6 January 2019

Cemiplimab

Cemiplimab is a monoclonal antibody used for patients with advanced cutaneous squamous cell carcinoma (SCC).

6 January 2019

Nodular basal cell carcinoma images

> Go to the image library

6 January 2019

Primary dermal melanoma

Primary dermal melanoma, also known as solitary dermal melanoma, represents melanoma confined to the dermis without an epidermal (junctional)...

6 January 2019

Blue toe syndrome

Blue toe syndrome, also known as occlusive vasculopathy, is a form of acute digital ischaemia in which one or more...

6 January 2019

Klippel-Trénaunay syndrome

Klippel-Trénaunay syndrome (KTS) is a rare congenital vascular bone syndrome that is characterised by a triad of symptoms and...

6 January 2019

Bird mite infestation

Bird mites are minute (< 1 mm long), oval-shaped arachnids with eight legs.

6 January 2019

Porokeratosis ptychotropica

Porokeratosis refers to a group of disorders characterised by abnormal keratinisation.

6 January 2019

Picosecond laser

A picosecond laser is a laser device that uses very short pulse durations to target endogenous pigmentation and exogenous ink...

6 January 2019

Tranexamic acid

Tranexamic acid is an anti-fibrinolytic agent, and is commonly used for heavy menstrual bleeding.

6 January 2019

Intralymphatic histiocytosis

Intralymphatic histiocytosis is a rare benign chronic skin condition most commonly associated with rheumatoid arthritis, orthopaedic metal implants, or cancer...

2 February 2019

Hidradenitis suppurativa guidelines

Hidradenitis suppurativa is a debilitating and distressing chronic inflammatory skin disease affecting about one in every 150 Australians.

6 January 2019

Cellulitis mimics

Cellulitis is an acute bacterial infection of the dermis and subcutaneous tissues of the skin.

6 January 2019

Intravascular lymphoma

Intravascular lymphoma is a rare subtype of large B-cell lymphoma in which lymphoma cells proliferate within the lumen of small...

6 January 2019

Nipple eczema

Nipple eczema is a localised dermatitis involving the nipple and areola, and is characterised by erythema and scaling.

6 January 2019

Carcinoma cuniculatum

Carcinoma cuniculatum is a rare, slow-growing variant of cutaneous squamous cell carcinoma (SCC).

6 January 2019

Linea nigra

Linea nigra is a physiological form of hyperpigmentation commonly seen in the first trimester of pregnancy [1–3].

6 January 2019

Convolutional neural networks in dermatology

A convolutional neural network (CNN) is a type of deep artificial neural network used in image processing.

10 January 2019

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Lichen simplex of the vulva

Lichen simplex of the vulva is a pruritic form of dermatitis in which excessive scratching or rubbing leads to lichenification.

6 January 2019

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Tildrakizumab

In March 2018, tildrakizumab (Ilumya™; Sun Pharma India) received US Food and Drug Administration (FDA) approval for the treatment of...

6 January 2019

Contact allergy to bufexamac

Bufexamac is a topical non-steroidal anti-inflammatory drug (NSAID).

6 January 2019

Lichen simplex of the scrotum

Lichen simplex of the scrotum is a pruritic form of dermatitis in which excessive scratching or rubbing leads to lichenification.

6 January 2019

Melanocortin 1 receptor gene

Melanocytes make two forms of melanin in the skin, hair, and eyes. 

6 January 2019

Medical hypnosis

Hypnosis, or hypnotherapy, induces someone to enter into a 'trance state' using deep breathing and relaxation, meditation and guided imagery. It mandates...

6 January 2019

Blood-based melanoma detection

Cutaneous melanoma is generally first suspected during a skin check and the diagnosis is confirmed by a positive skin...

6 January 2019

Acne in children

Prepubertal acne has been classified into the following age groups by a panel convened by the American Acne and Rosacea...

6 January 2019

Keratoelastoidosis marginalis

Keratoelastoidosis marginalis is an acquired form of marginal keratoderma.

6 January 2019

Atypical solar lentigo

An atypical solar lentigo is a solar lentigo with unusual characteristics.

6 January 2019

Atopy patch test

The classical tests for immediate type I hypersensitivity (allergy) are specific immunoglobulin E (IgE) antibody levels, such as the radioallergosorbent test...

6 January 2019

Listeriosis

Listeriosis is a bacterial infection caused by the bacteria Listeria monocytogenes.

6 January 2019

Prader-Willi syndrome

Prader–Willi syndrome is the most common genetic cause of obesity.  It was first described in 1887 by John Langdon Down,...

6 January 2019

Guselkumab

Guselkumab is a biological treatment indicated for moderate-to-severe psoriasis.The US Food and Drug Administration (FDA) has approved guselkumab (Tremfya™, Janssen...

6 January 2019

Rickettsia typhi

Rickettsiae are small, obligate intracellular, Gram-negative bacteria that spend part of their life cycle in an arthropod host (eg, a tick,...

6 January 2019

Climate change and skin

Climate change is a lasting alteration in patterns of weather caused by factors such as oceanic circulation, variations in solar...

6 January 2019

Pemphigoid nodularis

Pemphigoid nodularis is a rare nodular variant of bullous pemphigoid.

6 January 2019

Dermatopathology topics

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Eruptive xanthoma

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

6 January 2019

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Juvenile xanthogranuloma

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

6 January 2019

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Verrucous haemangioma

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

6 January 2019

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Myiasis

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

6 January 2019

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Systemic amyloidosis

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

6 January 2019

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Lichenoid drug eruption

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

6 January 2019

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Sclerosing lipogranuloma

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

6 January 2019

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Glomeruloid haemangioma

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

6 January 2019

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Splenosis

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

6 January 2019

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Treated melanoma

New therapies targeting BRAF and MEK have emerged as the key component for the treatment of BRAF-mutant metastatic melanoma.

6 January 2019

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Angiomatoid fibrous histiocytoma

Angiomatoid fibrous histiocytoma is an uncommon variant of fibrohistiocytic tumor with intermediate malignant potential (metastases are rare but do occur).

6 January 2019

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Angiokeratoma

Angiokeratoma presents as a blood-filled papule which may bleed following trauma.

6 January 2019

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Eosinophilic granulomatosis with polyangiitis

Eosinophilic granulomatosis with polyangiitis is also known as Churg–Strauss syndrome and allergic granulomatosis.

19 January 2019

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Pseudoepitheliomatous balanitis

Pseudoepitheliomatous keratotic and micaceous balanitis is a coronal balanitis that gradually takes on a silvery white appearance due to mica-like...

6 January 2019

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Neurofollicular hamartoma

Neurofollicular hamartoma presents as a smooth flesh-coloured papule on the face.Histology of neurofollicular hamartomaIn neurofollicular hamartoma, the histopathology shows a...

6 January 2019

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Neurocristic hamartoma

Neurocristic hamartoma presents as a slowly enlarging multinodular variably pigmented plaque. It most commonly presents in the head and neck region but...

6 January 2019

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Maculopapular mastocytosis

Maculopapular cutaneous mastocytosis was previously called urticaria pigmentosa.

6 January 2019

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Epithelioid haemangioma

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

6 January 2019

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Cutaneous larva migrans

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

6 January 2019

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Mesothelioma

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

6 January 2019

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Chickenpox

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

6 January 2019

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Synovial sarcoma

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

6 January 2019

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Clear cell fibrous papule

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

6 January 2019

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Gnathostomiasis

Human gnathostomiasis presents as larva migrans profundus, and is caused by ingesting gnathostoma larvae.

6 January 2019

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Subungual melanoma

Subungual melanoma is cancer that arises from a malignant proliferation of melanocytes in the nail matrix. 

6 January 2019

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Lichen aureus

Lichen aureus is a distinct subtype of pigmented purpuric dermatosis.

6 January 2019

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Elastofibroma

Elastofibroma usually presents on the back (usually in the subscapular region) as a poorly defined mass or pseudotumour.

15 January 2019

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Intralymphatic histiocytosis

Intralymphatic histiocytosis manifests as quite non-descript erythematous patches or plaques. Autoimmune disease, malignancy, joint replacements, and rosacea appear to be aetiologic...

6 January 2019

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Panfolliculoma

Panfolliculoma is a benign neoplasm of follicular differentiation that was initially described by Ackerman et al.

6 January 2019

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Glomangioma

Glomangiomas (also called glomuvenous malformation) differ clinically from glomus tumors in that they occur in childhood and adolescence, are usually asymptomatic,...

6 January 2019

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Combined cellular blue naevus and trichoepitheliom

Combined trichoepithelioma and cellular blue naevus is a rare lesion that may mimic melanoma clinically.Histology of combined trichoepithelioma and cellular blue...

17 January 2019

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Cutaneous plasmacytosis

Cutaneous plasmacytosis presents with multiple reddish-brown nodules.

6 January 2019

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Pseudocarcinomatous hyperplasia in anaplastic larg

Pseudocarcinomatous hyperplasia can occasionally be observed in biopsies of CD30-positive lymphoproliferative disorders.

6 January 2019

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Lymphangioma circumscriptum

Lymphangioma circumscriptum presents on the skin surface as grapelike groups of thin-walled, translucent, lymph-filled vesicles, often compared with frog...

6 January 2019

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Mycosis fungoides

IntroductionMycosis fungoides is the most common form of cutaneous T cell lymphoma. It is characterised by infiltrates of lymphocytes. It has an...

6 January 2019


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