Necrobiosis Lipoidica - Clinical Features and Treatment

Introduction

Necrobiosis lipoidica is a skin rash most commonly affecting the shins (front part of the vertebrae between knee and foot) and is seen more often in women. It is one of the most dramatic skin conditions usually associated with diabetes. It results in reddish-brown skin areas, mainly on the lower legs. Necrobiosis lipoidica lesion starts as a firm, smooth, red bumps (papules) seen in the lower extremities, usually in the same areas on opposite sides of the body. They are painless in the early stages; as the papules enlarge, they flatten down, which develops as a yellow-brown center with raised red to purplish edges with defined borders. The veins are visible below, which can spread and join together to form the appearance of a patch. The lesion rarely occurs on the forearms and may occur on the feet, stomach, face, scalp, palms, and soles. Trauma causes the lesion to develop ulcers. Nodules may also develop, which is very itchy and painful. Necrobiosis lipoidica is a different form of ulcer that occurs on the feet or ankles in people with diabetes.

What Is Necrobiosis Lipoidicia and Who Gets It?

Necrobiosis is a rare granulomatous disorder most commonly found on the shins, showing a well-defined plaque. Lesions have an irregular border that is raised and indurated. Necrobiosis lipoidica is three times more common in females and usually develops in young and middle-aged adults.

• Three percent of patients with diabetes may develop necrobiosis lipoidica.

• Occurs in patients with type 1 and type 2 diabetes mellitus.

• Patients with necrobiosis lipoidica have diabetes or prediabetes.

• Diabetes associated with this can be well-controlled or poorly controlled.

• Other associations include obesity, hypertension, dyslipidemia, and thyroid disease.

• Necrobiosis lipoidica is rare in children.

What Is the Cause of Necrobiosis Lipoidicia?

The cause of necrobiosis lipoidica is unknown. However, theories that have included blood vessel changes such as development in diabetes or antibody-mediated vasculitis, or any underlying health condition that may be the cause.

What Are the Clinical Features Found in Necrobiosis Lipoidica?

Necrobiosis lipoidica begins as a dull reddish papule or plaque on the lower extremity, which enlarges into one or more yellowish-brown patches on the rim.

The Patches:

• Most often occur on both shins, rarely on other sites.

• It can be asymptomatic or tender.

• It can be round, oval, or irregularly shaped.

• Central atrophy shows shiny, pale, and thin, with prominent blood vessels.

• It may show reduced sweating and sensation in the affected area.

Dermoscopy of Necrobiosis Lipoidica:

• The yellow structureless background is seen.

• Linear vessels with uniform branching are seen.

• White linear streaks showed.

How Does Necrobiosis Lipoidica Appear in Differing Skin Types?

In patients with the same skin color, the patches and the plaques are hyperpigmented around the lesion's periphery. Centrally developed hyperpigmentation is seen with atrophy and prominent blood vessels.

What Are the Complications of Necrobiosis Lipoidicia?

Ulceration complicates one-third of necrobiosis lipoidica, usually following a minor injury to an established patch. Ulcers caused due to necrobiosis lipoidica are at high risk of secondary bacterial infection and delay the healing process. In addition, squamous cell carcinoma was reported to develop in ulcerated necrobiosis lipoidica. Patients with the following conditions are at increased risk of developing it:

• Thyroid Disease - A medical condition that keeps the thyroid gland from making the right amount of hormones.

• Celiac Disease - A disorder that is triggered while eating gluten.

• Hypertension - High blood pressure that affects the body's arteries.

• Obesity - Excessive body fat that increases the risk of health problems.

• Chronic Heart Failure - The heart works less efficiently than usual.

• Elevated Lipids in the Blood (Dyslipidemias) - Unhealthy levels of more than one or more lipid (fat) substances in the blood.

How Is Necrobiosis Lipoidica Diagnosed?

Necrobiosis lipoidica was clinically diagnosed based on people who have symptoms of it. Such patients should see a doctor as soon as possible. Even though the condition is harmless, complications such as infection or scarring may occur. Therefore, a skin biopsy may be performed on the affected site using a local anesthetic to confirm the diagnosis. The histopathology shows a granulomatous inflammatory reaction around destroyed collagen. A doctor may also ask about any other symptoms or arrange for additional tests to look for any underlying health condition, such as diabetes or a thyroid condition.

What Is the Differential Diagnosis of Necrobiosis Lipoidicia?

• Actinic Granuloma - It is a disorder in middle-aged adults that appears in sun-exposed skin where central atrophy is seen and raised erythematous margins are similar to necrobiosis lipoidica.

• Necrobiotic Xanthogranuloma - It is a rare progressive granulomatous disorder that shows red-brown yellowish plaques and nodules resembling necrobiosis lipoidica.

• Sarcoidosis - It is an inflammatory disease affecting one or more organs, primarily the lungs and lymph nodes. Symptoms include rashes or red or tender lumps.

• Erythema Nodosum - It is a painful disorder characterized by tender bumps (nodules) under the skin. It is an inflammatory disorder where symptoms show firm, hot, red, and painful lumps on the skin. Usually appears on the shin, similar to necrobiosis granuloma.

What Is the Treatment of Necrobiosis Lipoidicia?

The best is to start treatment for necrosis lipoidica early to reduce the risk of ulcers developing and subsequent scarring. Even though the condition is mild, monitoring the lesions can resolve spontaneously. The following treatments are sometimes effective as a doctor may recommend any one combination of the following treatments depending on the severity of the symptoms:

• Oral corticoids such as Prednisone.

• Corticosteroid is given topically or as injections into the inflamed areas of the skin.

• Antimalarial drugs, such as Hydroxychloroquine, reduce inflammation.

• Ultraviolet treatment to help control the flare-ups.

• Photodynamic therapy (a treatment that involves a light source to destroy abnormal cells).

• Immunomodulating drugs, such as Cyclosporine, help in healing ulcers.

• Medications are used to thin the blood, such as Aspirin.

• Surgically lesions are removed, and grafting is done to repair the skin.

Conclusion:

Necrobiosis lipoidica is a condition that remains stable or slowly progresses over the years. Therefore, consulting as early as possible may help to manage any underlying health conditions or identify undiagnosed health conditions. In addition, treating earlier helps in reducing ulcers and infections.