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DermNet NZ is the world’s free resource and authority on all things skin. We help thousands of people make informed, evidence-based decisions on how to care for skin conditions, by providing reliable information at the click of a button.

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

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Treatment of psoriasis in pregnancy

Psoriasis, a chronic inflammatory skin condition, is common in women of reproductive age.

Ichthyosis prematurity syndrome

Ichthyosis prematurity syndrome is a rare, genetically recessive skin disorder in which infants are born prematurely with abnormal skin covered...

Pityriasis rosea

Pityriasis rosea is a self-limiting rash, which resolves in about 6–10 weeks.

Cowden syndrome

Cowden syndrome is a rare inherited condition characterised by overgrowths including mucocutaneous tissues with increased risk of malignancies.

Acanthosis nigricans

Acanthosis nigricans is a skin condition characterised by darkening and thickening of the skin (velvety overgrowth of the epidermis).

Skin reactions to COVID-19 vaccines

There are a spectrum of skin reactions following COVID-19 vaccination including local site reactions, urticaria, a delayed large local reaction...

Patch tests

Patch testing is undertaken for the investigation and confirmation of substances that produce allergic contact dermatitis.


Keratoacanthoma (KA) is a common, rapidly growing, locally destructive skin tumour.

Linear IgA bullous disease

Linear IgA bullous disease is a rare, autoimmune, blistering disease which blisters form on the skin and mucous membranes.

Sjögren syndrome

Sjögren syndrome is an autoimmune disease that causes dry eyes and dry mouth as it mainly affects secretory glands of...

Contact allergy to hydroperoxides of limonene and linalool

Limonene and linalool are fragrance chemicals extracted from the peel of citrus fruits (limonene) and herbs, flowers, and woods (linalool).

Fibrous papule of the nose

A fibrous papule of the nose is a common and harmless skin lesion.

Non-dermatophyte mould onychomycosis

Non-dermatophyte mould onychomycosis (NDMO) is an opportunistic fungal nail infection (onychomycosis) caused by moulds.

Carcinoid syndrome

Carcinoid syndrome is characterised by episodic cutaneous flushing, diarrhoea, and wheezing.

Skin conditions relating to HIV infection

Skin conditions conditions are extremely common during HIV infection and will affect approximately 90% of all people living with HIV.

Childhood infections

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

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 characterised by pustules and honey-coloured crusted erosions ('school sores').


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

Hand foot and mouth disease

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

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 is a common viral skin infection of childhood that causes localised clusters of umbilicated epidermal papules.

VIral warts

A viral wart is a very common benign lesion caused by infection with human papillomavirus (HPV).

Head lice

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


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

Slider: Childhood infections

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