Foot & Ankle Conditions Houston Podiatrist, Dr. Vargas. Whether you have foot pain, heel pain, bunions, toenail fungus, a sports-related foot or ankle injury, or an ankle sprain, Dr. Vargas can help you with diagnosis and treatment. Houston podiatrist, Dr. Vargas is also specialized in diabetic-related foot conditions, children's foot conditions, and custom orthotics. So, if you have been dealing with foot or ankle pain for a few weeks, or a few years, now is the best time to start feeling better!