Friction Blisters Clinical Presentation
- Author: Robert A Schwartz, MD, MPH; Chief Editor: Dirk M Elston, MD more...
History
Friction blisters tend to occur in areas of thick adherent stratum corneum (eg, palms, soles, heels, dorsa of fingers). In regions of the body where the stratum corneum is thinner, a repeated friction force causes the stratum corneum to erode, and instead of a blister, an erosion or abrasion occurs. Children often present with poorly fitting shoes and reporting a blister on the heel.
The likelihood of forming a friction blister at susceptible sites is based on the magnitude of the frictional force and the number of times an object moves across the skin (ie, shear cycles). Moisture and lubricating substances present on the skin surface are additional factors. With a greater frictional force, fewer cycles of rubbing against the skin are needed to produce a blister.
Moisture on the skin surface may either increase the friction force or, in the case of very moist skin, decrease it temporarily by providing lubrication. Lubricating agents also tend to reduce the friction force temporarily at the onset; however, friction tends to increase with prolonged application of the external force.
Pyogenic granuloma on the hand has been described subsequent to a friction blister in a hand surgeon.[6]
Physical
Discrete bullae formation at sites of trauma is evident.
Causes
Poorly fitting shoes are the most common cause. Heat, sweating, and maceration of the skin may predispose to friction blister formation. A study of foot blister formation in 3 groups of 11 participants showed biomechanical interactions on the plantar surface of individuals prone to blisters to be at variance from less predisposed to this finding.[7]
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