Check with the Institute of Diabetes and Nutrition in POP (there are offices in both POP and Santiago). When I've gone there to purchase insulin, I've seen that one of the docs is usually treating patients with foot problems. I don't know what his specialty is. Although he is treating more severe problems like ulcerations and infections, he may be able to refer you to someone who does routine foot care if he doesn't do it himself. BTW, bring a translator if you are not fluent in Spanish.