What does a foot blister look like?

A blister is a small pocket of fluid within the upper layers of the skin, typically caused by forceful rubbing (friction), burning, freezing, chemical exposure or infection. Most blisters are filled with a clear fluid called serum or plasma. However, blisters can be filled with blood (known as blood blisters) or with pus (if they become infected).

Blisters are a very common cause of foot pain symptoms. They occur frequently on the bottom of the feet but can also be seen on the top and side of the foot. In the foot at least, the primary cause is friction. The most common cause is a poor fitting shoe combined with an activity that creates excessive friction on a certain part of the foot. You can also get foot blisters from eczema and athletes foot. In addition they can occur from burns and situations where the feet are too moist thus increasing friction.

From the excessive friction the upper layer of skin, the epidermis, separates from the middle layer of skin, the dermis. Fluid fills in and the blister is formed. Initially the lesion is formed to actually protect an area but more often than not on the foot the blister will begin to hurt.

A foot blister will form as a bump. Underneath the bump will be fluid.

Continue Learning about Blisters

How can I avoid blisters from my high heels?
Dr. Mehmet Oz, MDDr. Mehmet Oz, MD
Apply bandages or moleskin to problem areas to prevent blister formation. Use a lubricant like petro...
More Answers
How do I treat a blister?
Shirley A. Jones, RNShirley A. Jones, RN
Treatment of a blister focuses on preventing infection and soothing the painful, red, irritated skin...
More Answers
What are possible complications of foot blisters?
Pamela F. Carthew , NASM Elite TrainerPamela F. Carthew , NASM Elite Trainer
Blisters are painful and can become infected if you do not take good care of them. The skin that is ...
More Answers
Are there any alternative treatments for foot blisters?
Jill Goldstein Jill Goldstein
When my feet are covered in blisters from walking/running, I tape my feet with athletic tape availab...
More Answers

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.