Patient was instructed about how make sure the shoes fit well. Even the slightest rubbing or misfit shoe can cause a blister that turns into a sore that becomes infected and never heals. Buy better-fitting shoes, or try different socks, even at the most minor signs of redness or irritation, since you may not be able to feel when it's getting worse. Before buying or putting on the shoes check your shoes for rough seam, sharp edges or other objects that could hurt your feet. Further teaching is needed.