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Bathtub suction-induced purpura
Maeran C Landers1, Theresa L Schroeder
1Department of Dermatology, Oregon Health & Science University, Portland, OR, USA.
Abstract:
We report two cases of bathtub suction-induced purpura. Two girls, ages 9 and 14 years, developed recurring purpura "spontaneously" in the same lower back location and in the same U-shaped distribution. The patients had similar histopathologic findings, with extravasated erythrocytes and a sparse superficial inflammatory infiltrate. After extensive evaluation, one patient eventually admitted to self-inducing her lesions by creating suction against a bathtub. The second patient denied self-inflicting her lesions; however, her purpura improved when she stopped taking baths.
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