Scleroderma literally means "hard skin", derived from the Greek words sklerosis (which means hardness) and derma (which means skin). Often thought of as a single disease, scleroderma is actually a symptom of a group of diseases that are complicated by an abnormal growth of connective tissue ( tissue which supports the skin and internal organs).
Some types of scleroderma have a limited abnormal process which primarily making the skin hard and tight. Other types are more complicated, affecting blood vessels and internal organs, such as the:
Scleroderma is considered both a rheumatic disease (conditions characterized by inflammation and pain in the muscles, joints, or fibrous tissue) and a connective tissue disease (conditions that affect the major substances in the skin, tendons, and bones.)
There are two main classes of scleroderma:
- localized scleroderma (affects only certain parts of the body)
- systemic sclerosis (affects the whole body)
Localized types of scleroderma affect the skin and related tissues, and sometimes the muscle below. Internal organs are not affected. Localized scleroderma can never progress to the systemic type of the disease. Localized types can improve over time, but the skin changes that occur when the disease is active can be permanent. It can be serious and disabling. There are two types of localized scleroderma: Morphea and Linear.
Reddish patches of skin that thicken into firm oval-shaped areas are distinctive of the morphea type of localized scleroderma. The center of the patches are ivory, with violet borders. The patches can occur on the:
The patches typically sweat little and have little hair growth. Morphea can be localized (limited to one or several patches, ranging from half-inch to 12 inches in diameter) or generalized (skin patches are hard and dark and spread over larger areas of the body.) Morphea generally fades out in 3 to 5 years but people can have dark skin patches and, though rare, muscle weakness which remains.
A distinctive single line or band of thickened, abnormally colored skin typically characterizes the linear type of localized scleroderma. The line typically runs down an arm or leg but can run down the forehead.
Systemic sclerosis not only affects skin but also involves blood vessels and major organs.
People with systemic sclerosis often have symptoms of all of the following, known as CREST:
- Calcinosis (formation of calcium deposits in the connective tissue)
- Raynaud's phenomenon (small blood vessels of hands or feet contract in response to cold or anxiety. Hands or feet turn white, cold, then blue)
- Esophageal dysfunction (impaired function of esophagus occurs when smooth muscles in the esophagus lose normal movement)
- Sclerodactyly (thick and tight skin on fingers resulting from deposits of excess collagen within skin layers)
- Telangiectasias (small red spots on the hands and face caused by swelling of tiny blood vessels)
Systemic sclerosis is broken into two categories, diffuse and limited.
Limited scleroderma typically has gradual onset and is restricted to certain areas of the skin, such as:
- lower arms
Raynaud's phenomenon is often experienced for years before skin thickening is evident. Others experience skin problems over much of the body, which shows improvement over time, leaving only the face and hands with tight, thickened skin. Calcinosis and telangiectiasias often follow. Limited scleroderma is sometimes referred to as CREST syndrome because of the predominance of CREST symptoms in these patients.
Diffuse scleroderma typically has sudden onset. Skin thickening is quick and covers much of the body, typically in a symmetric pattern. Major internal organs can be damaged. Symptoms common with diffuse scleroderma include:
- loss of appetite or loss of weight
- joint swelling
- joint pain
Skin can swell, appear shiny, and feel tight and itchy. The damage of diffuse scleroderma occurs over a period of a few years.
After about 3 to 5 years, patients tend to stabilize, a phase when progression seems little and symptoms subside -- but gradually, skin changes begin again. A phase recognized as softening occurs, during which less collagen is made and the body rids itself of excess collagen. The last areas thickened are reversibly softened. Some patient's skin returns to what seems like normal while the skin of others becomes thin and fragile. Patients with diffuse scleroderma face the most critical prognosis, if they develop complications in the:
- digestive tract
Less than one-third of patients with the diffuse type of scleroderma develop these complications.
Some recognize sine scleroderma as a third category of systemic sclerosis. Sine scleroderma differs from limited or diffuse systemic sclerosis by not affecting the skin.
Scleroderma Handout On Health. NIAMS.