A cut, blister, or sore on your foot or lower leg that hasn't healed after a few weeks is not something to keep bandaging and hoping about. When a wound stalls like that — especially if it's on the foot or toes, or comes with aching pain in the foot when you rest — it can be a sign that blood flow to the area is severely reduced. That's a warning sign of advanced peripheral artery disease (PAD), and it's one worth acting on quickly.
Why a wound stops healing
Healing is hungry work. To close a wound, your body needs a steady delivery of oxygen-rich blood, immune cells, and nutrients to the injured tissue. When the arteries feeding your leg and foot are narrowed by atherosclerosis, that supply falls short — and a wound that would normally scab over and shrink instead stays open, or grows.
In its most advanced form, this is called chronic limb-threatening ischemia (CLTI) — defined by ongoing pain in the foot at rest, non-healing wounds or ulcers, or tissue that has begun to die (gangrene). About 11% of people with PAD progress to this most severe stage (2024 ACC/AHA multisociety PAD guideline). The tissue simply isn't getting enough blood to repair itself.
This is also why people with diabetes need to be especially watchful. Nerve damage can dull the pain that would otherwise sound the alarm, so a wound can quietly worsen while the underlying circulation problem goes unnoticed. A small blister from a tight shoe, a nick from trimming a nail, or a callus that breaks down can each become the starting point for a wound that won't close — and by the time it's obvious, circulation may already be the reason it's stuck. Daily foot checks and prompt attention to any new sore are simple habits that catch trouble early.
Why waiting is the real danger
Here's the part worth being direct about: once poor circulation is driving a wound, it rarely heals on its own, and the stakes are high. Among people with chronic limb-threatening ischemia, the one-year amputation rate is roughly 15 to 20%, and one-year mortality ranges from 15 to 40% (2024 ACC/AHA PAD guideline). Those numbers are sobering — but they describe untreated or advanced disease, not an inevitability.
The message is the opposite of hopeless. Prompt evaluation and, when feasible, restoring blood flow are what facilitate limb salvage (2024 ACC/AHA PAD guideline). Reviews of this condition consistently emphasize that timely revascularization is central to saving the limb (Chronic Limb-Threatening Ischemia and the Need for Revascularization). In short, the danger isn't the diagnosis — it's the delay.
Watch for these signals and treat them as reasons to be seen, not to wait and watch:
- A sore, ulcer, or blister on the foot or lower leg that hasn't healed in about two to four weeks
- A wound that is growing, darkening, or draining
- Aching or burning pain in the foot or toes at rest — often worse at night when lying flat, relieved by dangling the foot
- Skin on the foot that is pale, shiny, cool, or bluish
- A toe or area of skin turning black
Restoring blood flow — usually without open surgery
The good news is that the fix targets the root of the problem: reopening the artery so blood — and healing — can reach the wound. For many people this is done through endovascular treatment: a thin catheter is guided to the blockage through a pinhole in the skin, and the narrowed or blocked artery is reopened from the inside, with no large incision.
For chronic limb-threatening ischemia, guidelines call for prompt endovascular or surgical revascularization to give the limb its best chance (2024 ACC/AHA PAD guideline). Where the anatomy is suitable, the minimally invasive endovascular route offers meaningful advantages over open bypass — less anesthesia, a shorter hospital stay, and fewer procedural complications (2016 AHA/ACC PAD guideline). In real-world registries, endovascular therapy and bypass surgery have shown comparable amputation-free survival over several years, which is why the approach is matched to each person's blockages rather than applied one-size-fits-all (Clinical outcomes after revascularization in CLTI).
It's fair to be honest about the limits, too. Restoring flow is what allows a wound to heal, but healing still takes time, and wound care, infection control, and follow-up all matter — as does keeping the artery open afterward, since re-narrowing can occur. That's why treatment works best as part of a coordinated plan rather than a single procedure.
What to do right now
If you have a wound on your foot or lower leg that isn't healing — or pain in the foot at rest — the right move is a prompt evaluation, not another week of waiting. A simple, painless test called the ankle-brachial index, along with an exam, can quickly tell whether circulation is the problem. Catching advanced PAD early is strongly linked to better outcomes and a lower risk of amputation.
If any of this sounds familiar, our 2-minute PAD assessment is a plain-language place to start, and you can explore the minimally invasive PAD treatments we offer to restore circulation and give a stubborn wound its best chance to heal. If you notice leg discomfort earlier — cramping when you walk that eases with rest — our companion article on leg pain when you walk covers those first signs.
