Medically reviewed by Drugs. Last updated on Jan 31, Heat rash — also known as prickly heat and miliaria — isn't just for babies. It affects adults, too, especially during hot, humid weather. Heat rash develops when blocked pores sweat ducts trap perspiration under your skin. Symptoms range from superficial blisters to deep, red lumps.
Prickly heat, or heat rash, is an itchy skin rash with small red spots all over the affected areas. It is common in Australia in hot and humid areas. Heat rash or sweat rash is caused by a blockage and inflammation of sweat ducts during times of exposure to heat and high humidity. These blocked sweat ducts cause sweat to divert into adjacent tissue thus producing the itching and prickling sensations associated with the condition. Doctors call this condition miliaria.
Treating a heat rash also known as miliaria is pretty straightforward and, for both kids and adults, involves keeping the area cool, dry, and irritation-free. Most of the time, heat rash is composed of small, prickly, itchy bumps with a halo around them miliaria ruba, or prickly heat that are uncomfortable, but otherwise not of concern. But the condition can cause pus-containing vesicles miliaria profunda and lead to infection if not properly treated.
Longer days, barbecues at the park, beer gardens - there are so many things we love about the warm weather. But the inevitable heat rash cue burning, stinging, itching - you get the drift really isn't one of them. So in a bid to keep our limbs rash-free this summer, we enlisted one of the best dermatologists in the business to fill us in on how to stop the unsightly and oh-so-itchy bumps from ruining your cool. Justine Kluk.