Hello my friend I am Dr.Arianisa Thanks for your question on HCM I read your question very carefully and can tell you that a diabatic person has more risk to develop what is called diabetic foot.The most common causes of diabetic foot include: 1.poor circulation 2.high blood sugar (hyperglycemia) 3.nerve damage 4.irritated or wounded feet Your father should check his feet every day and report to the doctor any sores or cuts that do not heal, puffiness, swelling, and skin that feels hot to the touch. Control of glucose, blood pressure and cholesterol; smoking cessation and weight control. Hygiene (daily washing and careful drying); moisturising areas of dry skin. Nail care are rally important. When to seek advice from a healthcare professional: if any colour change, swelling, breaks in the skin, corns or calluses, pain or numbness are found, or if self-care and monitoring are not possible or difficult (eg, because of reduced mobility) Hope this information is helpful to you Best regards.