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To the Editor.—
The shape of skin lesions has a constant fascination for dermatologists. Most commonly discerned are the round and oval forms, with their annular, concentric, polycyclic, and arciform variants. More complex are their distortions into gyrate, figurate, and serpiginous outlines. Linear and band patterns are equally striking. Whorls, dendritic and reticulate patterns, as well as V and S shapes are among the rarer types. Other shapes may poetically inspire the imagery of ash leaves and fir trees, clouds, horns, serpents, the coast of Maine, or simply a bathing suit. Some forms defy description, but always we know that nature abhors the square, the rectangle, and the triangle. The presence of these geometric forms or of bizarre configurations bespeaks of an external factitious origin rather than a natural disease process (Siemens HW: General DiagnosisTriangular area of hair growth on scalp of patient represents uninvolved area at confluence of
Shelley WB. Triangular Hair Patch as Sign of Alopecia Areata. Arch Dermatol. 1974;109(1):102. doi:10.1001/archderm.1974.01630010074035