Heat rash on the bottom of the feet

Sweat, heat and occlusive footwear can irritate the feet and block sweat ducts. Heat rash may cause prickling, itch, small bumps or tiny blisters, although the thick skin of the soles can make changes look less obvious. Peeling, scaling between the toes, a strong odour or a rash that persists despite cooling can point to a different condition, such as a fungal infection or contact irritation. Skin bumps and skin redness pages offer broader symptom context.

Remove warm shoes and damp socks when possible. Wash gently, dry carefully between the toes and choose breathable footwear with clean, moisture-wicking socks. Rotate shoes so they can dry fully, and avoid tight straps that rub the soles. A cool foot soak can soothe symptoms; dry the feet immediately afterwards. Avoid thick greasy layers between the toes. A fragrance-free emollient can help dry, cracked areas; see Emollient Therapy for more detail. Do not use steroid treatment on a scaly or uncertain rash unless a clinician has advised it.

See a clinician if walking becomes painful, the rash is one-sided, blisters recur, or symptoms do not settle after keeping the feet cool and dry. Prompt care is appropriate for spreading redness, warmth, swelling, drainage, fever or a wound that does not heal. People with diabetes, reduced circulation or reduced sensation should seek advice early for new foot skin changes.

Does this look like heat rash, fungal infection or contact dermatitis? Should I change my footwear or use an emollient? Is any treatment safe for the soles? Which changes mean I should seek urgent foot care?