Diabetes also affects the flow of blood. Without good blood flow, it takes longer for a sore or cut to heal. Poor blood flow in the arms and legs is called “peripheral vascular disease.” If you have an infection that will not heal because of poor blood flow, you are at risk for developing ulcers or gangrene (the death of tissue due to a lack of blood).

Nails that are infected with a fungus may become discolored (yellowish-brown or opaque), thick, and brittle and may separate from the rest of your nail. In some cases, your nail may crumble. The dark, moist, and warm environment of shoes can help a fungus grow. An injury to your nail can also lead to a fungal infection. Fungal nail infections are hard to treat. Medications applied to the nail are available, but they only help a small number of fungal nail problems. You may need prescription medicine that you take by mouth. Your doctor might also remove the damaged nail.

A corn is a buildup of hard skin near a bony area of a toe or between toes. Corns may happen because of pressure from shoes that rub against your toes or cause friction between your toes. Be sure to take care of them properly. After your bath or shower, use a pumice stone to gently remove the built-up tissue. Do not use over-the-counter remedies to dissolve corns. DO NOT try to cut the corn or remove it with a sharp object.

A bunion forms when your big toe bends toward your second toe. Often, the spot where your big toe joins your foot becomes red and callused. This area also may stick out and become hard. Bunions can form on one or both feet. They may run in the family, but most often they’re caused by wearing high-heeled shoes with narrow toes. These shoes put pressure on your big toe, pushing it toward your second toe. Felt or foam padding may help protect the bunion from irritation. Your doctor can also use a device to separate the big and second toes. If the bunion causes severe pain or deformity, you might need surgery to realign your toes.

A hammertoe is a toe that is bent because of a weakened muscle. The weakened muscle makes the tendons in your toe shorter, causing your toe to curl under your foot. Hammertoes can run in families. They can also be caused by shoes that are too short. Hammertoes can cause problems with walking and can lead to blisters, calluses, and sores. Splints and corrective shoes can treat them. In severe cases, you may need surgery to straighten your toes.