The fungus is probably present on the skin for many months or years, but under appropriate climatic or local skin conditions it begins to multiply. The disease appears to be on the increase, possibly because of the popularity of travel to areas where the fungus is more prevalent. It is easily diagnosed, when suspected, by the sighting of bright yellow fluorescence of the affected

skin under the Wood’s lamp. Direct examination under the microscope will confirm the diagnosis. The response to various applications is good although recurrences are common. Initially, 20 per cent sodium thiosulphate in water, or 2-5 per cent selenium sulphide lotion, should be tried. Alternatively tolnaftate or miconazole creams may be used. Griseofulvin is ineffective in the treatment of this disorder.

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