Sclérodermie localisée

What is localised scleroderma?

Scleroderma is a condition that causes areas of the skin to become harder than usual. Hence the name scleroderma, which means hard skin.

There are two kinds of scleroderma.

• Localised scleroderma (also known as morphoea or morphea) only affects the skin. In some cases it can spread to the tissues underneath the skin, such as muscles and bones.

• Sclérodermie systémique affects the skin but may also involve the body's internal organs. See separate leaflet called Systemic sclerosis for more details.

The rest of this leaflet is only about localised scleroderma.

Types of localised scleroderma

There are different types of localised scleroderma. The most common types are:

• Plaque morphoea.

• Superficial morphoea.

• Linear scleroderma.

• En coup de sabre.

• Generalised morphoea.

Symptoms of localised scleroderma

Localised scleroderma usually comes on gradually. Areas of the skin may be thickened and discoloured, and hair may be lost over the area of scleroderma.

Sclérodermie

© Leith C Jones at English Wikipedia, CC BY 3.0, via Wikimedia Commons

Agrandir

Plaque morphoea symptoms

Plaque morphoea are oval patches that can range from 2-20 cm across. They start off mauve in colour, then gradually become white. Older patches may become brown. The surface is smooth, shiny and hairless. One to three plaques may develop in different areas of the skin. This type mainly affects adults and usually has no other symptoms or problems, although the affected skin can look unsightly.

Superficial morphoea symptoms

Superficial morphoea is similar to the plaque type. It is typically seen as symmetrical mauve-coloured patches, usually in skin folds of the groin, armpits or under breasts. This type is most commonly found in middle-aged women.

Linear scleroderma des symptômes

Linear scleroderma usually occurs on an arm or leg of a child. It is a long, narrow area of thickened skin. In more severe cases the tissues just beneath the skin are affected which may cause scarring (contractures) underneath the skin.

En coup de sabre symptoms

En coup de sabre is a deep form of linear scleroderma affecting the scalp and temple. The name comes from its shape, meaning 'like a sword cut'. Hair is lost over the affected skin, and the skull bone may be shrunk underneath it.

Generalised morphoea symptoms

This is a rare type where there are more plaques spread around different areas of the body.

Causes of localised scleroderma

The cause is not clear. What is known is that cells called fibroblasts make too much of a protein called collagen. The collagen gets deposited in the skin, causing scarring and thickening (fibrosis).

It is not known why the fibroblasts produce too much collagen in the areas of affected skin. It is probably some fault with the immune system. It is sometimes seen after the development of diseases in which the immune system attacks the body's own cells (autoimmune conditions), such as lichen scléreux et lichen planus. It can also occur after tick bites (Lyme disease), rougeole, radiothérapie, local injury to the skin and pregnancy. Most of the time, however, there is no obvious cause.

How common is localised scleroderma?

Localised scleroderma is uncommon. The exact number of people affected is not known. However, it is thought that quite a number of cases are not diagnosed. This is because many people who have a small plaque or two of localised scleroderma causing no symptoms may not report it to a doctor.

It is two or three times more common in women than in men. It can occur at any age and is as common in children as it is in adults. About 3 in a million children in the UK and Ireland develop localised scleroderma every year. Children are nine or ten times more likely to develop localised scleroderma than systemic sclerosis.

Diagnosing localised scleroderma

Localised scleroderma can usually be recognised by its appearance. The diagnosis can be confirmed by a biopsie.

A biopsy is a procedure in which a small sample of skin is removed under local anaesthetic and examined under the microscope. Sometimes blood tests can give a clue but there is not a specific blood test for this condition.

Dans certains cas une échographie ou un examen d'imagerie par résonance magnétique (IRM) may be used to assess whether the scleroderma is affecting tissues underneath the skin. X-rays are occasionally used to check that children's bones are growing properly.

Treatment for localised scleroderma

The most common form, plaque morphoea, does not always need treatment. This form often does not cause symptoms and often gradually improves or clears away after a number of years.

However, strong creams or ointments are sometimes used as they may help to stop it spreading.

Creams which may be used include:

• Cream or ointment containing calcipotriol.

• Tacrolimus ointment.

• Imiquimod crème.

• Crèmes ou onguents stéroïdiens.

For other types of localised scleroderma, treatment will vary depending on the individual situation, the severity of the condition and whether underlying tissues are affected. One of the creams or ointments above may be used in some cases. If it is too widespread or too deep or too severe, one or more of the following treatments may be used:

• Ultraviolet light therapy.

• High-dose stéroïdes.

• Medicines affecting the immune system, such as méthotrexate or mycophenolate mofetil. Other treatments sometimes used include hydroxychloroquine, ciclosporin, and penicillamine.

• Physiotherapy or surgery may help if the skin is very tight or if there is a deformity or scar underneath the skin.

Complications of localised scleroderma

Usually, localised scleroderma does not cause any complications. It is not linked to the systemic sclerosis form of scleroderma and it does not involve internal organs.

Some types of localised scleroderma may affect not only the skin but the tissues directly underneath it such as bone or muscle. This only happens in the deeper types of scleroderma (linear scleroderma and en coup de sabre). In this situation, the scleroderma can affect growth in the underlying tissues and so may cause some degree of deformity. About one third of people with deep localised scleroderma have this type of problem. Rarely, if the affected skin is located on the head, the brain or eye can be affected.

Quel est le pronostic ?

Limited plaque morphoea tends to improve with time, often over 3-5 years, but some cases may last for many years with new lesions developing as old one's fade. Some improvement in generalised plaque morphoea is usually seen over a few years, although the condition may last for many years.

The affected areas of skin may gradually go back to normal. However, a brown stain may remain and sometimes a small depressed area of skin. In some cases the plaques remain for many years.

Linear-type localised scleroderma tends to persist for longer but may improve after several years. It may come and go and may flare up after a long time of being settled. However, linear-type localised scleroderma, especially the en coup de sabre subtype, may become more extensive with time. This may cause severe contractures that result in limited movement and permanent disability of an arm or leg. Damage to underlying brain and eye tissue is a potential, serious complication of the en coup de sabre subtype.