Peripheral artery disease (PAD) causes a set of visible changes in the legs that get more noticeable as the condition progresses. In the earliest stages, your legs may look completely normal. But as narrowed arteries reduce blood flow over months and years, the skin, hair, nails, and muscle of the affected leg begin to change in ways you can often see and feel without any medical equipment.
Skin Changes You Can See and Feel
One of the earliest visual signs is skin that looks unusually smooth and shiny, almost waxy. The skin loses its normal texture because reduced blood flow affects the cells that maintain it. Over time, the skin on the lower legs and feet may also become noticeably dry and prone to cracking. If you run your hand along the shin or calf, the skin often feels cool compared to the rest of your body, especially compared to your other leg if only one side is affected.
Color changes are a hallmark of PAD. Skin on the affected leg can appear pale, bluish, or even slightly purple. One of the more distinctive signs is what happens when you change position: if you raise the affected leg while lying down, the foot turns noticeably pale within seconds or minutes. When you then sit up and let your legs hang down, the foot flushes an unusual dark red. This pale-to-red shift with positioning is a classic indicator of significantly reduced blood flow. People with advanced PAD sometimes sleep in a chair with their legs hanging down, or walk around at night, because gravity helps pull what little blood flow there is into the foot.
Hair Loss and Nail Changes
Hair loss on the legs and feet is one of the signs people notice first, though they often don’t connect it to a circulation problem. The hair on the lower leg, ankle, and tops of the toes thins and eventually disappears entirely on the affected side. This happens because hair follicles need steady blood flow to sustain growth, and PAD gradually starves them.
Toenails change too. They tend to grow slowly and become noticeably thicker, sometimes turning brittle or discolored. The nails may develop ridges or an opaque, yellowish appearance. These changes happen gradually, so many people assume it’s just aging or a fungal infection rather than a sign of poor circulation.
Muscle Wasting in the Calf and Foot
As PAD progresses, the muscles in the lower leg don’t get enough oxygen-rich blood to maintain their size. The calf on the affected side can look visibly thinner than the other, and the foot may appear bony or hollow. This muscle wasting happens partly from the disease itself and partly because pain during walking (called claudication) causes people to use the leg less. In moderate PAD, this cramping pain kicks in after a few blocks of walking and goes away with rest. In more severe cases, the pain starts after less than a city block, which drastically limits activity and accelerates muscle loss.
Wounds That Won’t Heal
One of the most concerning visible signs of PAD is sores or ulcers on the feet and lower legs that heal extremely slowly or not at all. These arterial ulcers have a distinctive look: they tend to be small, round, and deep, almost like someone used a hole punch on the skin. The edges are clean and well-defined, and the base of the wound looks pale or yellowish rather than the healthy pink-red you’d expect from a healing wound. They’re most common on the toes, between the toes, along the outer ankle bone, and on the shin.
These ulcers are typically very painful, and the skin surrounding them feels dry and cool. The pain often improves when you let your leg hang down off the edge of the bed, since gravity helps blood reach the area. This is the opposite of what you’d do for a venous ulcer (a wound caused by poor vein function rather than poor artery function), which feels better when you elevate the leg.
How PAD Looks Different From Vein Problems
Leg changes from PAD can look similar to problems caused by poor vein circulation, but there are key visual differences. Venous insufficiency tends to cause swelling, varicose veins, and thick, scaly skin that looks almost like alligator hide, usually around the inner ankle and lower calf. Venous ulcers are shallow with irregular, weepy borders. The leg often feels warm and heavy.
PAD looks nearly opposite. The leg is thin rather than swollen, the skin is smooth and shiny rather than thick and scaly, and it feels cool rather than warm. Arterial ulcers are deep and round rather than shallow and irregular. If you press on the top of the foot, the pulse may be weak or impossible to find, while in venous disease the arterial pulse is still strong (though swelling can make it hard to locate). These distinctions matter because the two conditions require very different management.
What Advanced PAD Looks Like
In its most severe form, called critical limb ischemia, PAD produces changes that are hard to miss. The foot and toes may turn dark purple, greenish, or black as tissue begins to die from lack of blood supply. This is gangrene, and it can appear as dry, mummified-looking black tissue on the toes or as wet, infected-looking tissue with drainage. Pain at this stage is constant, even at rest, and often worst at night when the legs are flat in bed.
The progression of PAD follows a predictable pattern. It starts with no visible symptoms at all, moves to pain only during walking, then to pain at rest (especially at night), and finally to tissue breakdown with ulcers or gangrene. Not everyone moves through every stage. Many people stay in the early phases for years, particularly if risk factors like smoking, high blood pressure, and high cholesterol are addressed. But the visual changes tend to accumulate: first the hair thins, then the skin gets shiny and cool, then color changes appear, and eventually wounds may develop.
How PAD Is Confirmed
If you’re noticing these kinds of changes in your legs, a simple, painless test called the ankle-brachial index (ABI) can confirm whether reduced blood flow is the cause. It compares the blood pressure at your ankle to the blood pressure in your arm. A ratio of 0.90 or below confirms PAD. Values between 0.91 and 1.00 are considered borderline and usually prompt further evaluation. A normal result falls between 1.00 and 1.40. The test takes about 10 to 15 minutes and doesn’t involve needles or imaging.
Recognizing what PAD looks like matters because the disease is often underdiagnosed. Many people chalk up cool feet, thinning leg hair, or slow-healing cuts to normal aging. When several of these signs show up together, particularly on one leg more than the other, reduced arterial blood flow is a likely explanation worth investigating.