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Hello, Welcome to Just Answer and thanks for your question. Pus implies that there is an infection. You would need to see a medical provider to determine what is causing the infection. You can try washing your feet and applying over-the-counter antibiotic cream before putting on clean socks. You should also alternate 2-3 pair of shoes so that each pair has a chance to dry out thoroughly before being worn again. Sprinkle antibiotic powder into them before putting them on. Washing your feet again in the evening, applying ointment, and putting on clean footwear can also help. However, if this doesn't eliminate the problem in a week or two, you should see your medical provider for an exam. If you have no insurance you can try a free clinic. You can search for one in the links below, but you will probably find more in your local telephone directory.