Symptoms

Blisters usually manifest as a swelling on the skin’s surface that contains fluid. Some blisters may be painless, while some may be sensitive to pressure and cause discomfort.

Blisters may form singly or in clusters, depending on what caused them to develop.

Blood blisters are colored dark and are normally more painful than other blisters.

Infected blisters contain yellow or green pus. Like blood blisters, they are painful to the touch. The skin surrounding an infected blister may appear red or there may be thin red streaks. It may also feel warm. In most cases, the fluid within the bubble is slow reabsorbed by the body as new skin grows under it.
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