For Doctors · Clinical review

Lipodermatosclerosis: The Red Leg That Isn’t Cellulitis

By Dr Johan Blignaut, Specialist Surgeon · Vein Centres South Africa · October 2026

Written for general practitioners and other clinicians. This page summarises the review; the full text, tables and references are in the PDF.

Summary

Lipodermatosclerosis is an inflammatory and fibrosing complication of chronic venous hypertension, classed as CEAP C4b disease. Its acute phase is regularly mistaken for cellulitis.

This review covers how common it is, what happens in the tissue, how to recognise and investigate it, and what current European and North American guidelines recommend.

Key points

1. A red, painful lower leg is not automatically cellulitis. Around 4 in 10 initial cellulitis diagnoses are revised on review.
2. Bilateral lower-leg erythema should prompt reconsideration of the diagnosis, though it does not absolutely exclude infection.
3. LDS is CEAP C4b disease — advanced chronic venous disease, not a cosmetic skin problem.
4. The diagnosis is usually clinical. Duplex ultrasound identifies the underlying venous pathology, including deep venous disease.
5. Check the arterial supply before compression, and avoid biopsy in severely diseased venous skin unless the diagnosis is genuinely in doubt.
6. Compression is evidence-based. ESVS recommends 20–40 mm Hg below-knee stockings for C4b disease (Class I, Level B); in the acute phase, bandaging or adjustable wraps are often better tolerated.
7. When C4–C6 skin changes coexist with treatable superficial venous incompetence, guidelines recommend intervention.
8. Drug treatment for LDS has much weaker evidence than compression and venous intervention.
9. Gemcitabine and other anticancer drugs can cause LDS-like pseudocellulitis.
10. Repeated “cellulitis” that does not behave like infection deserves a venous assessment, not another automatic course of antibiotics.

When to refer to a vein specialist

• Suspected LDS with no previous venous duplex assessment
• C4b skin changes with varicose veins
• Recurrent episodes labelled “cellulitis” without convincing infection
• A healed or active venous ulcer
• Significant unilateral venous skin changes
• Progressive induration despite compression
• Suspected deep or proximal venous obstruction
• ABPI below 0.8, or uncertainty about arterial supply before compression
• Uncertainty about whether a red leg is infection or chronic venous disease

What the full review covers

• A typical case: the patient on her third course of antibiotics
• Definition and the CEAP C4 subclasses
• How common it is, and who develops it
• Pathophysiology: from venous hypertension to fibrosis
• Clinical stages and presentation
• Recognising LDS in darker skin
• Distinguishing LDS from cellulitis, and the wider differential
• Chemotherapy-associated pseudocellulitis
• Diagnosis: duplex ultrasound, arterial assessment, blood tests, biopsy and skin ultrasound
• Does the size of the LDS area matter?
• Guideline recommendations: ESVS, UIP/EVF/IUA, SVS/AVF/AVLS, NICE
• Management: venous intervention, compression, skin care, drugs and lifestyle
• When to refer
• Recent literature and areas of uncertainty

How to cite

Blignaut J. Lipodermatosclerosis: The Red Leg That Isn't Cellulitis. Clinical review. Vein Centres South Africa; October 2026. Available from: https://www.veinsurgery.co.za/articles/doctors/lipodermatosclerosis-clinical-review.html

Disclosure. The author performs endovenous and other venous procedures in private practice. This article is for medical education and does not replace individual clinical assessment. Clinical photographs: Vein Centres South Africa, published with the patients’ written consent; identifying features have been removed.