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

Supported by and contributed to by New Zealand Dermatologists on behalf of the New Zealand Dermatological Society Incorporated.

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Skin signs of coma

Coma is a state of prolonged unconsciousness when the patient does not move or respond to a painful stimulus, light,...


Hibernoma, also known as fetal lipoma or lipoma of embryonic fat, is a rare subtype of benign lipomatous tumour derived...

Cutaneous diphtheria

Diphtheria is caused by Corynebacterium diphtheriae, a gram-positive bacillus.


Taxanes are a class of chemotherapeutic agents used in the treatment of some cancers [1].

Drug-induced hyperhidrosis

Hyperhidrosis is excessive sweating due to the overstimulation of the eccrine sweat glands by a neurotransmitter, acetylcholine [1].


A cutaneous angiofibroma is a benign vascular neoplasm composed of dermal fibrous tissue and blood vessels.

Vibratory urticaria

Vibratory urticaria is an uncommon form of chronic inducible urticaria in which urticarial weals follow a vibratory stimulus to the...

Acrodermatitis enteropathica-like conditions

Acrodermatitis enteropathica is a rare genetic disorder of zinc metabolism characterised by the triad of dermatitis, diarrhoea, and alopecia [1].

Patient-oriented PASI score

Go to the PO-PASI tool.

Epidermoid cyst

An epidermoid cyst is a benign cyst derived from the infundibulum or upper portion of a hair follicle, encapsulated in...

Vibratory angioedema

Vibratory angioedema is a rare variant of chronic inducible urticaria.


Macroglossia is an abnormal enlargement of the tongue [1].

Morphoea en coup de sabre

Morphoea en coup de sabre is a variant of linear morphoea (a localised form of scleroderma) restricted to the frontoparietal...

Personal protective equipment

Personal protective equipment (PPE) generally consists of wearable items designed to shield users from environmental hazards.

CLOVES syndrome

CLOVES syndrome is a rare, progressive congenital disorder that involves multiple organs including the skin, the vascular system, and the...

Subungual haemorrhage

Subungual haemorrhage is bleeding under a nail where blood is located between the nail matrix and nail plate.

COVID-19 and dermatology patients

Submit your photo of COVID-19-related skin conditions Please note that DermNet’s page is a summary about COVID-19 and may quickly...

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 (American spelling hemangioma) 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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