Why do doctors advise putting strips of wet cloth on the forehead of a person suffering from high fever?

Doctors advise putting strips of wet cloth on the forehead of a person suffering from high fever because the water from the wet cloth evaporates. During evaporation, the water absorbs latent heat from the forehead, which is at a higher temperature. 

This absorption of heat causes a cooling effect, helping to bring down the body temperature of the feverish person.