What should adults do about widespread prickly heat rash?

When adults develop widespread prickly heat, a comprehensive approach should be adopted for treatment: 1. **Environmental improvement**: Maintain a well-ventilated and cool indoor environment, reduce perspiration, use fans or air conditioning to regulate room temperature, control humidity, and avoid prolonged exposure to high temperature and humidity. 2. **Skin care**: Keep the skin clean and dry. Bathe frequently, using lukewarm water and mild cleansers, and avoid excessive friction or squeezing of the skin. Wear loose-fitting, breathable cotton clothing to facilitate sweat evaporation. 3. **Medication**: Apply topical treatments such as calamine lotion or prickly heat powder, which have cooling, astringent, and anti-itch properties, to relieve itching and discomfort. If symptoms are severe, topical corticosteroid creams or antihistamines may be used under a physician's guidance. 4. **Dietary adjustment**: Maintain a light diet, avoiding spicy, irritating foods and alcohol, which may exacerbate symptoms. 5. **Prevention of recurrence**: Take measures to prevent recurrence of prickly heat by avoiding strenuous exercise or heavy physical labor in hot and humid conditions, changing sweat-soaked clothing promptly, and keeping the skin clean and dry.