Seborrheic keratosis is a common cutaneous disease which most frequently occurs in elderly people, and especially, as its name implies, in those who have a seborrheic skin. Light, especially the actinic rays of light, is now considered to be in many cases the exciting cause of the trouble. There is no direct evidence in support of this view, but there are a number of phenomena difficult to interpret in any other way:
1. Patches of seborrheic keratosis begin very frequently as small pigmented spots, and the formation of pigment is a well-known effect of the action of light.
2. Seborrheic patches occur most commonly and most profusely in persons exposed to light.
3. They appear almost exclusively on the exposed surthefaces of the face, ears, neck and back of the hands, and der 0Slofls' as a whole, are analogous to those of xeroma pigmentosum, a disease in which light is
MONTGOMERY DW. UNUSUAL EXPOSURE TO LIGHT FOLLOWED BY SEBORRHEIC KERATOSIS. JAMA. 1913;60(1):7–9. doi:10.1001/jama.1913.04340010009004
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