Blisters are pockets of fluid between layers of the skin. The fluid is usually clear to slightly yellow in colour. It may be cloudy or coloured in the presence of an infection.
Blisters may be caused by several factors;
Friction – Rubbing from shoes or other surfaces can separate the layers of skin and caused fluid to collect
Sunburn – Excessive sun exposure may cause damage to the skin
Extreme Heat or cold – damage from these sources can caused painful blistering
Chemical burns – certain corrosive or toxic chemicals may cause a blistering reaction
Disease – Blistering may be a side effect of several diseases, such as infection, dermatitis of chicken pox.
Treatment for blisters should be considered, but isn’t always necessary. While a blister remains closed, they are usually sterile inside. Sometimes, the blister forms a protective cover over an injury.
If a blister ruptures, then the remaining flap of skin may be a haven for infection. Ruptured blisters should be dressed with an antiseptic dressing, and kept clean.
Sometimes, blister contain infective organisms, and need to be drained and treated. You doctor or podiatrist will be able to tell you what needs to be done.