How Long Does Heat Rash Last Without Treatment. Heat rash is also most common in young children though it can affect anyone at any age. Treatment for heat rash.
Older children can get heat rashes with exercise. How long does heat rash last. The rash will likely clear up without complications in two to three weeks as long as the person is not re exposed to the allergen.
Give cool or lukewarm baths without soap for 10 minutes 4 times per day.
Use techniques that cool off the skin. Talk with your doctor if you believe you may have something more serious or if you have heat rash that. The rash will likely clear up without complications in two to three weeks as long as the person is not re exposed to the allergen. Topical antibacterials for example antibacterial soaps may shorten the duration of symptoms even if there are obvious signs of infection.