Blisters on the feet are a common result of wearing ill-fitting shoes. This blister occurred as a reaction to an insect bite. This severe blister is in a common location for athletes: the bottom of the foot. This large single blister appears as if it could pop on its own and can be safely drained by following the proper procedures discussed in the First Aid Guide. The grouped blisters in this image exemplify the type of multiple, grouped blisters that you should not attempt to drain. Further, this type of blister configuration should warrant a visit to the doctor.
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Blisters, First Aid 

Picture of Blisters, First Aid: Blisters on the feet are a common result of wearing ill-fitting shoes. Divider line
Blisters on the feet are a common result of wearing ill-fitting shoes.
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Signs and Symptoms
Blisters typically develop on the soles of feet and the palms of hands when there is friction and irritation on the surface layer of the skin.

Depending on the severity as well as the stage of the blister, the appearance may vary.
  • Early stage blisters – redness of the skin on the affected area, such as on the heel, the instep, toes, or palms.
  • Mild, middle stage blisters – the affected area forms into a bubble-like swelling under the skin. The fluid is clear.
  • Moderate or severe, middle stage blisters – the affected area forms into a bubble-like swelling under the skin and may be quite large. Infected blisters look red around the edge, and the fluid is often pus-like or red. Additionally, infected blisters are painful and warm to the touch.
  • Late stage blisters – as the blister heals, the skin on the blister dries and typically sloughs off naturally, leaving healthy skin underneath.
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Last Modified: 22 Dec 2008
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