Rash from sweating too much: what to know

Sweat can soften the outer skin, while rubbing from clothing or skin folds causes irritation. Small red bumps, stinging or itch can occur where sweat remains, such as the neck, chest, back, groin or underarms. Heat rash is one possibility; a separate infection or another skin condition can look similar.

Heavy sweating may also be a symptom of an underlying problem. Excessive Sweating can occur on its own or alongside conditions such as Hyperthyroidism, Hypoglycaemia or Obstructive Sleep Apnoea. Heat Exhaustion is a concern when sweating comes with weakness, dizziness, headache, nausea or confusion.

Move to a cooler place, rinse the skin with lukewarm water and pat it dry. Change out of damp clothing, choose loose breathable fabrics and avoid scratching or thick, fragranced products over the rash. Keep folds dry and pause strenuous activity until you feel well.

If episodes keep returning, note where sweating occurs, what triggers it and whether medicines or night sweats are involved. A clinician can examine the rash and discuss options such as Iontophoresis, Botox For Sweating or Microwave Sweat Gland Treatment when excessive sweating itself needs treatment.

Get urgent help for confusion, fainting, severe weakness, trouble breathing, facial swelling, or rapidly worsening illness. Arrange a medical review if the rash is painful, blistered, pus-filled, spreading, feverish, or not settling after you cool and dry the skin. Recurrent unexplained sweating also deserves assessment.

Could this be heat rash, irritation, infection or another condition? What can I use safely on the affected area? Does the pattern of sweating suggest a treatable cause, and which treatment fits my skin and health history?