CASE REPORT
A 38-year-old Japanese male was referred to our department with a 5-year
history of a black macule without itching or pain on the right 5th
finger. The patient did not recall any traumatic events before the
onset. The patient had not engaged in any tasks or sports associated
with hand activities. The patient had an unremarkable medical history
and had received no medication, including anticoagulants and
antiplatelet agents. In a physical examination, a black macule measuring
2 mm in diameter was noted on the ulnar side of the right 5th finger
(Figure 1a). Dermoscopy showed a well-demarcated homogeneous reddish
black area involving the sulci cutis and crista cutis (Figure 1b). There
was a keratinized recess in the center. Histopathology revealed
hemorrhage within the corneal layer and dilated capillary venules
containing erythrocytes just beneath the epidermis with the
extravasation of erythrocytes around the venules (Figures 1c and 1d).
Therefore, the patient was diagnosed with solitary angiokeratoma
accompanied by intracorneal hemorrhage.