All About Foot Blisters: Symptoms, Diagnosis, Prevention


Blisters on feet usually manifest as a swelling on the skin that is accompanied by a bubble or a bunch of them. The fluid within the bubble is slowly reabsorbed by the body as new skin grows under it. Sometimes, blisters on feet can be excruciating, thus making walking impossible. On the other hand, they may be painless.

Blood blisters are often dark and normally the most painful. These are the itchy usually, but you should avoid scratching them. Infected blisters contain yellow or green pus which is caused due to various germs. Redness and leaking yellow fluid are symptoms of infection. Like blood blisters they are painful and warm to the touch. Plus, the skin around such a foot blister may appear red or may have thin red streaks visible.


An expert or a doctor will diagnose blisters on feet depending on your and your family’s medical history along with the appearance of your blisters. This is because the reasons for the occurrence of foot blisters may vary from allergic reactions to a physical or chemical reaction.

For diagnosing extreme conditions, the doctor may conduct a skin biopsy and your skin samples may be sent to laboratories for further examinations. A foot blister that forms without any apparent cause may be a sign of a medical condition and it is always a good idea to consult your physician.

However, in the following conditions it will be best to visit your doctor without any delay:

  • If you are of an elderly individual or are suffering from diabetes
  • If you experienced a foot blister which didn’t heal after two days (pus-filled, red, hot and painful blisters need intensive care!)
  • If the size of your blister grew larger than two inches in diameter
  • If you discover blisters on feet and do not know what is causing them


As foot blisters are mainly caused by friction, heat and sweating, avoiding these will reduce your chances of getting blisters on feet. Most of these preventive measure help hold back blisters from happening. However, some walkers will try everything, yet still fail to beat these watery fluids from occurring.

To minimize friction, choose shoes that fit you best. Extremely snug or loose shoes can create a problem. Avoid wearing too small or too big socks as they are responsible for friction which leads to blisters. Also try to keep your feet dry and away from sweaty conditions. You may do this with the help of talcum powder or petroleum jelly. Plus, avoid exposure to chemical irritants and sources of allergen (such as curtains and plants) that may trigger blisters.