Blisters on your feet are caused by a burn or friction against your skin. This is a common issue for anyone who walks or runs. The blister is filled with a liquid designed to heal the damaged area. Many times people will drain their own blisters, this can be another cause for infection. We recommend seeing a Podiatrist at Achilles Podiatry to treat your blister, especially if it is large in size or has become infected. If you choose to drain your blister make sure that your hands are clean and the device you use to drain the blister. Once the blister is popped, drain all liquid until the blister is flat. Then gently clean with gauze, apply antibiotic ointment and cover with a bandaid or a piece of gauze.