Heat rash, also known as prickly heat, may occur in hot and humid environments where sweat is not easily removed from the surface of the skin by evaporation. When extensive or complicated by infection, heat rash can be so uncomfortable that it inhibits sleep and impedes a worker's performance or even results in temporary total disability. It can be prevented by resting in a cool place and allowing the skin to dry. Following a few basic precautions should lessen heat stress. A variety of engineering controls including general ventilation and spot cooling by local exhaust ventilation at points of high heat production may be helpful.
Shielding is required as protection from radiant heat sources.
Evaporative cooling and mechanical refrigeration are other ways to reduce heat. Cooling fans can also reduce heat in hot conditions. Eliminating steam leaks will also help. Equipment modifications, the use of power tools to reduce manual labor and personal cooling devices or protective clothing are other ways to reduce the hazards of heat exposure for workers. Training first aid workers to recognize and treat heat stress disorders and making the names of trained staff known to all workers is essential.