Slide show: Common skin rashes

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Heat rash (miliaria)

Heat rash (miliaria) occurs when the flow of sweat is obstructed, usually due to hot, humid weather, overdressing, or tightfitting clothes.

Prickly heat (miliaria rubra) is a type of heat rash that appears as clusters of small, red bumps that produce a pricking or stinging sensation (A). Miliaria crystallina appears as clear, fluid-filled bumps that generally produce no other signs or symptoms (B).

Heat rash isn't serious and usually resolves with proper self-care methods, such as keeping the affected areas cool and dry and avoiding tight, restrictive clothes.

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