Heat rash on the bottom of the foot: what to know

The sole can stay warm and damp inside socks or closed shoes, while walking adds friction. A heat rash may look like small red or skin-coloured bumps, fine blisters, or a patch of irritation. Itching, stinging and prickling can be more noticeable after exercise or time in a hot environment. Peeling, a strong odour, deep tenderness or spreading redness can point to another problem, such as a fungal infection or bacterial inflammation, so appearance alone cannot confirm the cause.

Cool the foot, remove damp socks and let the skin dry fully. Choose breathable footwear, change socks after sweating, and avoid tight shoes until the irritation settles. Rinse gently and pat dry rather than scrubbing or popping bumps. A bland moisturiser may help if the skin feels dry, but avoid heavy occlusive products between the toes. A pharmacist or clinician can advise whether an anti-inflammatory cream is suitable for the sole and whether another treatment is needed.

Arrange medical advice if the rash is painful, hot, rapidly spreading, draining, associated with fever, or not improving after cooling and reducing moisture. Seek prompt assessment for marked swelling, difficulty walking, numbness, or skin changes in a person with diabetes or reduced circulation. A clinician can examine the sole and check for infection, eczema or a blistering condition.

Ask whether the pattern fits heat rash, whether footwear or sweating is contributing, and which product is safe on thick sole skin. Mention new shoes, recent exercise, itching between the toes, peeling, discharge, medical conditions and medicines.