In short. How arterial and mixed leg ulcers differ from venous ones, why compression can be dangerous without adequate circulation, and how blood supply is assessed first.
Key points
- Compression bandaging is safe when arterial supply is adequate and dangerous when it is not: in severe arterial disease it can reduce perfusion, increase pain, and tip borderline tissue into necrosis.
- The rule is simple — measure the circulation first, then compress.
- In mixed disease, reduced compression under close supervision may still be used alongside revascularisation, but that is a decision made with measurements, not by routine.
Not every leg ulcer is venous. Roughly one in five is arterial, caused by narrowed or blocked arteries, and a substantial number are mixed, with both venous and arterial disease present. The distinction matters because the standard treatment for one is harmful in the other: compression that heals a venous ulcer can critically reduce blood flow to an arterial one.
How arterial ulcers look
Arterial ulcers are typically painful, especially at night and when the leg is elevated, and are relieved by hanging the leg down. They sit on the toes, between the toes, on the heel, or over the shin, in skin that is pale, shiny, hairless, and cool, with thick nails and often no palpable pulses. Venous ulcers, by contrast, are usually less painful, sit above the ankle, and are surrounded by brown staining and swelling. Mixed ulcers show features of both.
Assessing circulation before treating
Pulses are felt, and the ankle–brachial index is measured, but calcified arteries in diabetes and kidney disease can give falsely reassuring readings, so toe pressures or a duplex ultrasound are used when doubt remains. Any ulcer that is not healing as expected, or that is painful at rest, needs a vascular assessment rather than another dressing change. That result decides everything that follows.
Compression without a circulation check is a risk
Compression bandaging is safe when arterial supply is adequate and dangerous when it is not: in severe arterial disease it can reduce perfusion, increase pain, and tip borderline tissue into necrosis. The rule is simple — measure the circulation first, then compress. In mixed disease, reduced compression under close supervision may still be used alongside revascularisation, but that is a decision made with measurements, not by routine.
Restoring blood flow
An arterial ulcer will not heal while the tissue is starved of blood. Revascularisation by angioplasty, stenting, or bypass surgery is often the only intervention that can make healing possible, and it is usually undertaken before or alongside wound care. This is why arterial and mixed ulcers belong to a vascular team as much as to a wound clinic.
Wound care alongside
Debridement is performed cautiously and only when circulation permits, because aggressive removal of tissue in an ischaemic limb can enlarge the wound. Dressings keep the wound moist and protected, and infection is treated promptly, because an ischaemic limb tolerates it poorly. Offloading the heel and protecting the toes reduce further injury. Stopping smoking and controlling diabetes, blood pressure, and cholesterol are not lifestyle advice on the side — they change the odds of keeping the limb.
Seek urgent review if
- Pain in the leg or foot occurs at rest, or wakes you at night.
- A toe or an area of skin turns white, blue, or black, or feels cold.
- Sudden severe pain, pallor, or loss of sensation — this may be an acute arterial blockage and is an emergency.
Frequently asked questions
Why can compression be dangerous for a leg ulcer?
Because not every leg ulcer is venous. In severe arterial disease, compression can reduce perfusion, increase pain and tip borderline tissue into necrosis. The rule is to measure the circulation first and compress afterwards, which is why ankle pressures and sometimes toe pressures are checked.
How do arterial ulcers differ from venous ulcers?
Arterial ulcers are typically painful, worse at night and when the leg is elevated, and relieved by hanging the leg down. They sit on the toes, heel or shin in pale, cool, hairless skin. Venous ulcers are less painful, sit above the ankle, and are surrounded by brown staining and swelling.
Can an arterial ulcer heal without restoring blood flow?
No. An arterial ulcer will not heal while the tissue is starved of blood. Revascularisation by angioplasty, stenting or bypass is often the only intervention that can make healing possible, and it usually comes before or alongside wound care.
Risks & Limitations
- Chronic wounds heal over months, not weeks. A wound that closes in three to six months of consistent care is a good result.
- Recurrence is common. Both diabetic foot wounds and venous leg ulcers frequently return, which is why protective footwear and compression continue after healing.
- Partial or complete failure of a skin graft or flap, which may require further surgery.
- Infection and biofilm, which delay healing by weeks and can spread deeply or into bone.
- Amputation risk in diabetes and vascular disease, which is reduced but never abolished by treatment.
- Prolonged dressings and repeated clinic visits. Offloading, compression, and follow-up are demanding and take months.
- Donor-site scarring and discomfort where a graft or flap was taken.
- Reduced or absent sensation in grafted and flap tissue, and around a healed diabetic foot wound.
When to Seek Care
- A wound that is enlarging or deepening, or that begins to expose bone, tendon, or joint.
- Black, grey, or dead tissue appearing in or around the wound.
- Spreading redness, warmth, or swelling around the wound.
- Fever, shivering, or feeling generally very unwell.
- Foul odour or pus from the wound.
- New or severe pain, including pain in the leg or foot at rest or at night.
- A toe or foot that turns black, cold, or blue.
- Loss of sensation in a foot or toe, or a new wound or blister you cannot feel.
References & Further Reading
- World Health Organization (WHO) — chronic wound and diabetes care resources
- NICE (National Institute for Health and Care Excellence) — guidance on wound care, diabetic foot problems, and pressure ulcers
- Wounds International — international consensus documents on wound infection, biofilm, and compression therapy
- American Society of Plastic Surgeons (ASPS) — plastic surgery guidance on wound closure
- Cochrane Library — systematic reviews in wound care and wound closure
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.