1, 2, 6– 11 Painful blisters can be lanced with a sharp sterile instrument, taking care to stay near the periphery and maintain the blister roof. 5 Factors that contribute to the formation of blisters include heat, moisture, poorly fitting shoes, and excessive or unusual exercises early in training. 1– 4 The most commonly affected sites include the tips of the toes, the balls of the feet, and the posterior heel. Acute friction on the soles of the feet results in horizontal shear forces which cause epidermal splits, with the separated layers then filling with blood or tissue transudate.
BLISTERS AND OTHER INJURIES ON THE FOOT FROM REPETITIVE FRICTIONīlisters were the most common complaint of marathon runners, with an incidence of 0.2–39% (table 1).
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