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To the Editor.—
Köbner's (isomorphic) phenomenon represents the induction by nonspecific trauma of a rash present spontaneously elsewhere. It is a matter of common experience that it occurs in lichen planus and psoriasis, but it also is seen in a number of rarer dermatoses.
Report of a Case.—
A 17-year-old boy had a six-week history of weight loss, thirst, and polyuria. Simultaneously, a profuse yellow-pink papular rash that involved the face, buttocks, and the extensor surfaces of the limbs developed. Funduscopic examination revealed lipemia retinalis. A clinical diagnosis of diabetes mellitus with eruptive xanthoma was made. The diagnosis was confirmed by the following values: serum cholesterol, 20 mmole/liter (normal, 3.1 to 6.2 mmole/liter); and serum triglycerides, 110 mmole/liter (normal, < 1.7 mmole/liter).The patient complained of generalized pruritus, and he noted that linear groups of papules along scratch marks on his thighs had developed (Figure). A subungual xanthoma at the
Barker DJ, Gould DJ. The Köbner Phenomenon in Eruptive Xanthoma. Arch Dermatol. 1979;115(1):112. doi:10.1001/archderm.1979.04010010078045