Figure 1. Post ambulatory swollen hands (POTASH) that developed during a half marathon.

A 62-year-old man presented with a swelling of not only the dorsal hands (red ovals), fingers (blue ovals), and thumbs (white ovals) (A and B), but also the palms (red ovals), ventral thumbs (white ovals) and fingers (blue ovals) (C and D). There is swelling proximal and distal to the gold wedding band on his left fourth finger (A and C). The edema is prominent and the skin lines, superficial vessels, and tendons on the dorsal hands (red ovals) cannot be seen (A and B). The ventral swollen thumbs (white ovals) and fingers (blue ovals) show erythema of the digits; there is blanching of the edematous palms (red ovals) (C and D).