Abstract
IT is known that the ultra-violet wave-lengths responsible for producing vasodilatation or erythema penetrate only a short way into human skin1,2. These studies, however, do not by themselves exclude a direct action of ultra-violet light on the blood vessels as the cause of the characterstic erythema, for they have shown that a small fraction (up to 20 per cent) of these wave–lengths is able to penetrate through the avascular epidermis to the vascular corium. Further evidence that the effect of ultra–violet light on the skin blood-vessels is an indirect one would therefore seem of interest.
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