Necrobiosis Lipoidica: Symptoms, Causes, Treatment

Collagen in affected skin is altered, and patches may persist for years. The condition is not an infection or proof of poor diabetes care. Its appearance alone does not diagnose high blood glucose.

Related reading: Erysipelas and spreading skin redness.

Reddish patches or bumps may expand into yellow-brown areas with a thin shiny center and a more prominent border. Lesions can initially be painless, but minor trauma may cause painful ulceration.

The cause remains uncertain; inflammatory, immune and small-vessel mechanisms are proposed. Association with diabetes does not mean everyone with diabetes develops it or that glucose control alone clears the lesions.

The disorder is more frequent in women and adults and can accompany diabetes or other metabolic conditions. Smoking is a modifiable risk. Absence of diabetes does not exclude the diagnosis.

A dermatologist assesses distribution and appearance and may request a biopsy if uncertain. Glucose testing may be appropriate. Vascular ulcers and other skin disorders must be distinguished before treatment is chosen.

Care depends on inflammation and ulceration. Options include specialist-directed topical treatment or injections into active borders and wound care. Evidence for some treatments is limited, and inappropriate steroid use can worsen skin thinning.

Complications include painful slow-healing ulcers, secondary infection and scarring. Skin cancer has rarely developed within longstanding lesions, so changing ulcers should not be ignored; progression to cancer is not inevitable.

No proven strategy prevents onset. Protect the shins from injury, address wounds early and stop smoking. Diabetes management supports general health and wound healing but does not guarantee lesion clearance.