What Causes Foot Ulcers and How Can They Be Treated?
Written by Dr. Ashutosh Shah, M.Ch., DNB (Plastic Surgery)
Director, Elegance Clinic, Surat
Dr. Ashutosh Shah is a Board-Certified Plastic, Cosmetic and Reconstructive Surgeon with more than 22 years of surgical experience.
A foot ulcer is an open area of damaged skin that does not heal normally. It may begin with something that seems minor, such as friction from footwear, a small cut, a pressure point, or a blister. When the foot has reduced sensation, poor blood supply, repeated pressure, or another underlying problem, that small injury may gradually become a deeper wound.
Foot ulcers need more attention than an ordinary skin wound because healing depends on what caused the ulcer in the first place. A wound related to diabetes and reduced sensation requires a different strategy from one caused mainly by pressure, circulation problems, trauma, or a structural abnormality of the foot. Treating only the visible wound without addressing its cause can delay healing and increase the chance of recurrence.
Treatment may include professional wound cleaning, appropriate dressings, pressure relief, infection management, circulation assessment, control of blood glucose when diabetes is involved, and treatment of the underlying condition. More complicated wounds may require specialist wound care, vascular assessment, or surgical treatment.
This article explains why foot ulcers develop, what can slow healing, how treatment is selected, and when a foot ulcer needs urgent medical attention.
Key Takeaways
- A foot ulcer is a wound that fails to heal normally.
- Diabetes, reduced sensation, pressure, poor circulation, friction, trauma, and foot deformities can contribute.
- Treatment should address both the wound and the reason it developed.
- Keeping pressure off the affected area can be an important part of care.
- Infection, poor circulation, or tissue damage can make healing much more difficult.
- A foot ulcer with signs of spreading infection or reduced blood flow may require urgent medical assessment.
- Persistent or complicated ulcers may require multidisciplinary wound, vascular, or surgical care.
What Is a Foot Ulcer?
A foot ulcer is a break in the skin of the foot that remains open or fails to heal as expected. It can occur on the sole, toes, heel, sides of the foot, or other pressure-bearing areas.
The appearance can vary widely. Some ulcers are shallow and small, while others extend deeper into the tissue. A wound may also become surrounded by thickened skin, callus, redness, swelling, or discolouration.
An important point is that the visible size of an ulcer does not always reflect how serious the underlying problem is. A relatively small wound can become difficult to heal when sensation or circulation is impaired.
What Causes Foot Ulcers?
Foot ulcers often develop because several factors act together rather than because of one isolated event.
Diabetes and reduced sensation
Diabetes can affect the nerves of the feet, reducing the ability to feel pain, pressure, heat, or minor injury. A person may continue walking on an injured area without realizing that the skin has been damaged. Diabetes can also be associated with circulation problems that interfere with healing.
Repeated pressure
Constant pressure on the same part of the foot can damage the skin. This is particularly important when there is a deformity, an unusual walking pattern, or footwear that concentrates pressure on one area.
Friction and poorly fitting footwear
Shoes that rub, pinch, or create repeated pressure can produce blisters and skin breakdown. Even a small area of friction can become an ulcer when the skin is repeatedly exposed to the same stress.
Poor circulation
When blood flow to the foot is reduced, the tissues may receive less oxygen and nutrients. This can make wounds slower to heal and can increase the risk of tissue damage. Arterial disease is one recognised cause of foot ulceration.
Previous injury
A wound may persist when the original injury is larger than it first appeared or when the area continues to experience pressure and friction.
Foot structure
Bony prominence or an abnormal pressure point can repeatedly overload the same area. Unless that mechanical problem is addressed, the ulcer may continue reopening.
What Does a Foot Ulcer Look Like?
There is no single appearance.
You may notice:
- An open wound
- A raw or moist area
- Thickened surrounding skin
- Persistent redness
- Swelling
- Discharge
- Darkened or pale tissue
- A wound that remains open despite routine care
Some people with reduced sensation may have surprisingly little pain despite a significant ulcer. That is one reason visual inspection of the feet is important in people who are at higher risk.
Why Do Some Foot Ulcers Heal Slowly?
Healing requires more than putting a dressing over the wound.
Several factors can interfere with recovery.
Continued pressure
If the person keeps walking or standing on the same damaged area, the wound may repeatedly break down.
Infection
An infected ulcer may become more painful, swollen, red, or produce discharge. Infection can also spread into deeper tissue.
Poor blood flow
Reduced circulation can limit the oxygen and nutrients required for tissue repair. Significant arterial disease may require vascular assessment rather than wound dressing alone.
Reduced sensation
When a person cannot feel pressure or injury normally, the original cause may continue without being noticed.
Smoking and general health
Smoking and some medical conditions can interfere with tissue healing. Nutrition, kidney function, anaemia, and overall health may also influence recovery.
How Are Foot Ulcers Treated?
Treatment is usually built around four questions:
Why did the ulcer develop?
How deep is the wound?
Is there infection?
Is blood supply adequate?
Once these questions are answered, treatment can be tailored to the individual.
Wound cleaning and dressing
The wound may need professional cleaning and removal of unhealthy tissue when appropriate. A suitable dressing can then protect the area and support a moist, controlled healing environment.
Different wounds need different dressings, so there is no single dressing that works for every ulcer.
Pressure relief
Reducing pressure on the affected area can be essential, particularly when the ulcer is associated with repetitive loading of the foot. Off-loading methods may be selected according to the location and cause of the wound.
Infection treatment
Antibiotics may be used when an ulcer is clinically infected. They are not routinely used simply because bacteria may be present on a chronic wound.
This distinction matters because unnecessary antibiotics do not solve the mechanical or circulation problem that caused the ulcer.
Blood-flow assessment
When poor circulation is suspected, vascular assessment may be necessary. If there are signs of severe ischaemia or tissue death, urgent specialist evaluation is required.
Management of the underlying condition
For people with diabetes, good overall blood-glucose management is an important part of reducing complications and supporting wound care. A wound team may also address footwear, pressure points, mobility, and other contributing factors.
Does Every Foot Ulcer Need Surgery?
No. Many ulcers can be managed without an operation when they are identified early and the underlying factors can be controlled.
However, surgery may be considered in selected situations, such as when there is extensive tissue damage, problematic dead tissue, an underlying structural issue, severe infection, or a wound that is not progressing despite appropriate conservative care.
The decision depends on the depth, cause, circulation, infection status, and general health of the patient.
A plastic or reconstructive surgeon may become involved when tissue coverage is needed after more complex wounds or when a defect cannot heal adequately with simpler wound management.
How Can You Help Prevent a Foot Ulcer From Getting Worse?
Daily protection is particularly important for people who have diabetes, reduced sensation, previous ulcers, or circulation problems.
Useful measures include:
- Check the feet regularly for cuts, blisters, cracks, or colour changes.
- Wear properly fitting footwear.
- Avoid walking barefoot when the feet are at risk.
- Keep pressure away from an existing wound according to the treatment plan.
- Follow dressing instructions carefully.
- Avoid cutting calluses or thickened skin yourself when the foot is high-risk.
- Attend follow-up appointments.
- Seek help early if the wound changes.
The goal is to detect a small problem before repeated pressure or infection turns it into a larger wound.
When Is a Foot Ulcer an Emergency?
A foot ulcer needs urgent assessment when there are signs that infection or blood-flow problems may be progressing.
Seek urgent medical care for symptoms such as:
- Rapidly increasing redness or swelling
- Severe or worsening pain
- Pus or foul-smelling discharge
- Fever or feeling unwell
- Black or dying tissue
- Marked colour change in the foot
- New loss of sensation
- A rapidly worsening wound
Clinical pathways recommend urgent referral when there are signs of ischaemia or gangrene, and urgent hospital assessment when infection appears to be spreading systemically.
When Should You See a Specialist?
A foot ulcer should be professionally assessed rather than managed indefinitely with home dressings.
Specialist evaluation is particularly important when:
- The ulcer has not started improving.
- There is diabetes or reduced sensation.
- Blood circulation is a concern.
- The wound keeps reopening.
- There is significant pressure or a foot deformity.
- Infection is suspected.
- The ulcer is deep or extensive.
- Previous treatment has not worked.
Foot ulcers can have multiple contributing causes, so some patients may need coordinated care involving wound specialists, vascular services, diabetes care, podiatry, or reconstructive surgery.
About Dr. Ashutosh Shah and Elegance Clinic
Dr. Ashutosh Shah, M.Ch., DNB (Plastic Surgery) is a Board-Certified Plastic, Cosmetic and Reconstructive Surgeon and Director of Elegance Clinic, Surat. He has more than 22 years of surgical experience in cosmetic and reconstructive procedures.
Conclusion
A foot ulcer is more than an open wound. It is often a sign that pressure, circulation, nerve function, infection, diabetes, trauma, or another underlying problem is interfering with the normal healing process. Treating the wound without addressing that cause can lead to delayed healing or recurrence.
The right treatment may include wound cleaning, appropriate dressings, pressure relief, infection management, circulation assessment, and treatment of the underlying condition. Some complicated ulcers may need specialist or surgical care.
Because foot ulcers can worsen quietly, particularly when sensation is reduced, early professional assessment is important. A wound that is becoming red, swollen, painful, infected, discoloured, or rapidly larger should not be ignored.
Book a consultation at Elegance Clinic, Surat, for professional assessment of a persistent or complicated foot wound and to discuss the appropriate treatment pathway.
Frequently Asked Questions
A: Diabetes, reduced sensation, pressure, friction, poor circulation, trauma, and foot deformities can contribute.
A: Some small wounds may improve, but a persistent ulcer should be professionally assessed because the underlying cause may prevent healing.
A: No. Antibiotics are generally used when there is clinical infection rather than simply because a chronic wound contains bacteria.
A: Yes. Reduced sensation, circulation problems, and other diabetes-related factors can interfere with healing.
A: Some complicated wounds may need surgical treatment, especially when there is deep tissue damage, problematic tissue, infection, or a structural cause.