An ulcer is an open wound or sore that will not heal or keeps returning. When you have ulcers on your feet and toes, it can be related to diabetes — specifically, a complication called neuropathy that causes you to lose feeling in your feet. A scrape, cut or puncture in your skin can turn into an ulcer, but you might not know it’s there if you have neuropathy.
Ulcers can lead to infections. Sometimes, the infection won’t go away and you may need to have part of your foot or toe surgically removed (amputated). About 15% of people with diabetes will get a foot or toe ulcer. Around 14% to 24% of people with diabetes in the U.S. need an amputation after they get an ulcer.
Foot and toe ulcers can happen to many people but might be more common in Black, Native American and Hispanic people. If you have an eye, kidney or heart disease related to diabetes, you’re also at a higher risk. About 15% of people with diabetes will get an ulcer, typically on the bottom of their foot. Some of those people will be hospitalized because of complications.
You’re also at a higher risk of getting foot and toe ulcers if you have any of the following conditions:
Ulcers are open wounds in your skin that can take on almost any shape. Some shapes are more common than others on specific parts of your body. For example, ulcers on your foot or toe might be shaped like a crater or a wedge.
Foot and toe ulcers vary in color. The most common colors are:
If your ulcer is black, that means cells in the tissues have died. This is called necrosis (gangrene).
There are many different sizes of ulcers. They start as small as 1 centimeter wide (about the size of a pea or a Cheerio) and can grow to the size of your entire foot if left untreated.
The depth of the ulcer can change, too. Several different classification systems exist to define the depth of an ulcer. The Wagner Diabetic Foot Ulcer Grade Classification System, for example, has six grades:
When an ulcer is starting to develop on your foot or toe, you might notice changes in your skin like:
As the ulcer gets worse, it can get wider, and longer and deeper — sometimes down to the bone. In advanced stages you might see:
Your healthcare provider can tell what type of ulcer you have based on four observations:
Your primary healthcare provider can diagnose an ulcer, but they might send you to a specialist for treatment. You might see a podiatrist, a provider who works with feet, or a wound specialist. For more complicated cases that require surgery, you might also see a plastic surgeon, anesthesiologist, orthopedic surgeon and/or vascular surgeon.
To find out precisely how deep the ulcer goes, and to see if it caused an infection in a nearby bone, they might order a:
Two types of ulcers can affect your feet and toes:
Neurotrophic ulcers occur primarily in people with diabetes, although they can affect anyone who has impaired sensation in their feet. They can be found anywhere on your feet, but they usually develop on the parts of your feet and toes that are most sensitive to weight (pressure points).
Neurotrophic ulcers don’t cause pain. But they can be serious if they aren’t treated promptly or they don’t respond to treatment.
A neurotrophic ulcer might be the following colors:
The thin borders of the ulcers are “punched out,” meaning that they’re taller than the surrounding tissues.
A condition called peripheral arterial disease can reduce blood flow to your extremities. When this happens, your foot tissue may start to die. The ulcers that form from reduced blood flow are called arterial ulcers.
The word “arterial” means “relating to arteries.” Arteries are blood vessels that transport blood from your heart to the rest of your body, including your feet and toes. Anyone can get an arterial ulcer, but people who smoke or have diabetes, high blood pressure or high cholesterol are at higher risk.
Unlike neurotrophic ulcers, arterial ulcers can form on many parts of your body, including:
Arterial ulcers are:
Arterial ulcers don’t bleed. The borders and surrounding skin usually appear taller. If you have an infection or experience irritation, you might see swelling and redness around the base of the ulcer. The redness often turns to a pale white or yellow color if you elevate your leg. Arterial ulcers are typically very painful, especially at night.
There are many possible reasons why you might get foot and toe ulcers. The most common causes include:
No, foot ulcers aren’t like other foot conditions that might be passed from person to person (contagious). You can’t spread a foot or toe ulcer to — or catch it from — someone else.
The treatment of all ulcers begins with careful skin and foot care. Inspecting your skin is very important, especially for people with diabetes. Detecting and treating foot and toe sores early can help you prevent infection and keep the sore from getting worse.
The goal of treating a foot or toe ulcer is to heal your wound and relieve any pain. Your treatment plan will be individualized based on what medical condition is causing your ulcers. If you can’t correct the cause of your ulcer, it’s likely to come back after treatment.
There are both surgical and nonsurgical treatments for foot and toe ulcers. For early-stage foot and toe ulcers, nonsurgical treatments might work. More advanced ulcers — especially ones that are infected — might require surgery.
Nonsurgical treatments include:
Invasive and surgical treatments include:
Your healthcare provider might teach you how to care for your ulcers at home. You might be instructed to:
It might take weeks to months for an ulcer to heal (with treatment).
There are several things you can do to help reduce your risk of getting foot and toe ulcers. Sometimes, adopting these habits can even stop them from coming back. Try to:
If you have diabetes, it’s important to see a podiatrist regularly. Whether you have diabetes or not, you should see a healthcare provider immediately if you find an ulcer on your foot or toe. Left untreated, it could get infected, leading to complications like amputations.
A note from Cleveland Clinic
It can be distressing to discover an open sore on your foot or toe. You might not know what caused it, it might not be healing and, if you have neuropathy from diabetes, you might not even feel it. Keep in mind that your healthcare provider can successfully treat your ulcer, especially if it’s found early. If left untreated, an ulcer can lead to serious complications.
If you have neuropathy caused by diabetes, remember that it’s important to check your feet and toes on a regular basis. Check your toes and feet every time you shower or when you go to put on your shoes. Contact your healthcare provider right away if you find an ulcer.
Last reviewed by a Cleveland Clinic medical professional on 04/27/2022.