Heat rash on the soles of the feet: what to know

Heat rash, also called prickly heat, happens when sweat cannot leave the skin easily. Closed shoes, warm flooring, damp socks and repeated rubbing can keep the soles hot and moist. The area may sting or itch, and tiny spots can appear on the skin. Similar changes can be described as [Skin Bumps](/symptoms/skin-bumps/) or [Skin Redness](/symptoms/skin-redness/), but a foot rash can also have other causes.

On the soles, scaling, peeling, a strong odour, cracks between the toes or a rash that persists after cooling may point away from simple heat rash. A clinician can examine the pattern and ask about footwear, sweating and new products.

Remove hot or tight footwear when practical, wash gently, pat dry and allow the feet to cool. Change damp socks, choose breathable shoes and avoid scratching or vigorous rubbing. A cool, clean compress may ease the prickling. Do not apply heavy occlusive products to sweaty soles; if dryness or cracking remains after the skin has cooled, ask whether [Emollient Therapy](/treatments/medical-dermatology/emollient-therapy/) is suitable. Avoid borrowing medicated creams, especially on broken skin.

Arrange medical advice if the rash is spreading, painful, blistered, draining, cracked or not settling after cooling and reducing friction. Seek prompt care for marked swelling, warmth, pus, fever, red streaking or difficulty walking. Sudden severe foot pain or rapidly changing skin also needs urgent assessment. These signs can indicate infection, inflammation or another condition rather than uncomplicated heat rash.

Could the pattern on my soles be heat rash, fungal infection or contact irritation? Which cleanser, footwear and moisturiser are appropriate? Should I stop any foot product? Would a short course of [Topical Corticosteroids](/treatments/medical-dermatology/topical-corticosteroids/) be appropriate, and what symptoms would mean I should return?