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DermNet 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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Skin reactions to face masks

Face masks and respirators are examples of personal protective equipment (PPE) worn over the mouth and nose to protect the...


Dermographism is an exaggerated weal and flare response that occurs within minutes of the skin being stroked or scratched.

Benign lymphoplasmacytic plaque

Benign lymphoplasmacytic plaque is a pseudolymphoma in children characterised by one or more chronic skin lesions, either solitary or in...

Urticaria - an overview

Urticaria is characterised by very itchy weals (hives), with or without surrounding erythematous flares.

Aphthous ulcer

An aphthous ulcer is the most common ulcerative condition of the oral mucosa, and presents as a painful punched-out sore...

Atopic dermatitis

Atopic dermatitis, also called atopic eczema, the most common inflammatory skin disease worldwide, presents as generalised skin dryness and ‘the...

Pustular psoriasis of pregnancy

Pustular psoriasis of pregnancy, also known as impetigo herpetiformis, is a rare variant of generalised pustular psoriasis that occurs in...

Fixed drug eruption

Fixed drug eruption is a distinctive cutaneous allergic reaction that characteristically recurs at the same site(s) on re-exposure to the...

Brachioradial pruritus

Brachioradial pruritus is a localised form of neuropathic cutaneous dysaesthesia on one or both upper limbs.

Median canaliform nail dystrophy

Median canaliform nail dystrophy is a clinically characteristic change in the nail plate presenting as a midline longitudinal furrow or...

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 benign lesion 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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