What should you know about miliaria rubra?

The rash may look like clusters of small red bumps or tiny blisters. It often feels prickly, itchy or burning rather than deeply painful. Neck folds, the upper chest, back, waist and areas covered by tight clothing are common sites. Heat, humidity, sweating, fever, heavy clothing and prolonged skin-to-skin contact can encourage it. The rash is not contagious. A skin rash or redness can have many causes, so its pattern and the circumstances around onset help distinguish heat rash from infection, allergy or another condition.

Move to a cooler setting, take lukewarm showers, and pat the skin dry. Wear loose, breathable clothing and change out of damp garments. Keep affected folds dry and avoid fragranced products, greasy ointments and vigorous rubbing. A plain emollient may support irritated skin when it does not trap heat. A clinician may recommend a short course of topical corticosteroid for persistent inflammation; do not apply one to the face or skin folds without specific instructions.

Arrange care if the rash is worsening despite cooling, lasts beyond a reasonable recovery period, becomes painful, develops pus or forms a spreading warm area. Seek urgent help for fever with marked illness, confusion, breathing difficulty, facial swelling or rapidly spreading redness. Adults with repeated episodes may need review of medicines, work conditions or another cause of sweating.

Does the pattern fit miliaria rubra? Which skin products can I use while it settles? Would a corticosteroid be appropriate, and how long should I use it?