The condition also called prickly heat

It often produces small bumps with a prickling, itchy, or burning feeling in hot, humid conditions. Areas covered by clothing and skin folds are frequent sites because heat, sweat, and friction collect there.

Heat rash can present with tiny clear blisters, red or skin-coloured bumps, and localised itching or prickling. Redness may be less obvious on deeper skin tones, so texture and discomfort can be more noticeable than colour.

Not every rash after heat exposure is prickly heat. Contact irritation, eczema, folliculitis, fungal infection, and medicine reactions can look similar. Pain, pus, marked warmth, or illness makes a simple blocked-sweat-duct explanation less reassuring.

Move to a cooler, well-ventilated setting, change out of sweaty clothing, and keep the area dry. Choose loose, breathable fabric and use a cool compress or cool shower. Avoid heavy ointments that trap heat and resist scratching, which can break the skin.

A light, fragrance-free moisturiser may suit dry or irritated areas, but treatment choice depends on the rash. Ask a pharmacist or clinician before using a medicated cream on a baby, a large area, broken skin, or the face.

Arrange assessment if the eruption is worsening despite cooling, repeatedly returns, covers a large area, or develops increasing pain, swelling, pus, crusting, or spreading warmth. Fever, unusual drowsiness, confusion, dizziness, vomiting, or difficulty drinking during heat exposure needs prompt medical care because these can indicate heat illness or infection rather than uncomplicated prickly heat.

Seek emergency help for collapse, confusion, seizure, or very hot skin with severe illness.

Ask whether the distribution and type of bumps fit heat rash, whether infection or another skin condition is possible, which cooling or topical measures are suitable for the affected body area, and how to reduce recurrence in hot weather.