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Hives (urticaria) are a reaction to the release of histamine into the skin.

Body lice can spread from one person to another when the environmental conditions are crowded and unhygienic.

Itching scalp can be caused by a number of conditions, including dandruff, seborrhoeic dermatitis and psoriasis.

Bedbugs have highly developed mouth parts that can pierce skin.

Cradle cap is not contagious and it is not caused by poor hygiene or bad parenting.

If you have scabies, your sexual partners and household members need to be treated. More on symptoms, scabies rash, diagnosis, treatment, prevention and where to get help.

Most babies get nappy rash at some stage, no matter how well they are cared for.

Fleas are parasites that feed off the blood of humans and animals, and can spread infection.

If you are bitten or stung by an insect or animal, apply first aid and seek medical treatment as soon as possible.