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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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Palmoplantar keratoderma Nagashima type

Palmoplantar keratoderma Nagasima type is the most common form of diffuse hereditary palmoplantar keratoderma in Asians.

Tinea corporis

Tinea corporis is a superficial fungal infection of the skin that can affect any part of the body, excluding the...

Onycholysis

Onycholysis is a common nail disorder in which the nail plate has separated from the nailbed typically resulting in a...

Contact allergy to gold

Contact allergy to gold is a delayed type hypersensitivity reaction following exposure to gold or its alloys, typically manifesting as...

Calcaneal petechiae

Calcaneal petechiae, also known as talon noir (‘black heel’), is due to the accumulation of blood in the stratum corneum...

Skin complications of paraplegia and tetraplegia

Paraplegia and tetraplegia are a loss of neurological function usually resulting from a spinal cord injury.

Leprosy

Leprosy, also called Hansen disease, is a chronic bacterial infection primarily affecting the skin and peripheral nerves usually caused by...

Venous insufficiency

Venous insufficiency occurs when the normal flow of blood from the superficial veins to the heart via the perforating and...

Collagen

Collagen is the main protein in many structural supportive connective tissues in the body such as skin, bones, ligaments, tendons,...

Dermoscopy of achromic naevus

Achromic naevus, also called naevus depigmentosus or hypochromic naevus, is a pale (hypopigmented) birthmark due to an abnormal clone of...

Childhood infections

Meningococcal petechiae
Meningococcal disease

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

Measles
Measles

Measles is a highly contagious viral infection causing fever and a rash. Early symptoms are like the common cold, with...

Chickenpox
Chickenpox

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
Impetigo

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

Boil
Boil

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
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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