Frequently asked questions

It is a rare disease in which the fascia — the sheet of connective tissue just beneath the skin — becomes inflamed and thickened, so the skin and limbs feel hard, tight and swollen. It was first described by Dr Lawrence Shulman in 1974 and carries the ICD-10 code M35.4.

The cause is unknown. In up to half of cases, symptoms begin within weeks of an unusually strenuous bout of physical activity, and the disease is thought to be an abnormal immune reaction. It is not caused by anything you did wrong.

No. Eosinophilic fasciitis cannot be caught from another person and cannot be passed to anyone else.

There is no evidence that it is inherited. It occurs sporadically and is not known to run in families.

Usually swelling first, then a progressive hardening and tightness of the arms and legs. The skin can take on an orange-peel texture, and surface veins may sink into a linear furrow (the “groove sign”). The fingers and face are typically spared, but nearby joints can become stiff and hard to straighten.

From the clinical picture together with a full-thickness biopsy — sampling skin down to muscle — which is the definitive test. An MRI and blood tests (often showing raised eosinophils) usually support the diagnosis.

It is rare and easily mistaken for scleroderma, so diagnosis is often delayed. Because a delay of more than about six months is linked to a poorer response, it is worth asking for an early referral to a rheumatologist or dermatologist.

There is no outright cure, but it usually responds well to treatment and can enter long remission. Most patients improve significantly.

The first-line treatment is corticosteroids (such as prednisone), often combined with methotrexate — the combination works better than steroids alone. Severe cases may receive intravenous steroid “pulses”, and physiotherapy helps preserve movement.

It can. Around a quarter of people who respond to treatment relapse later, which is why follow-up continues even after you feel better.

Rarely. Eosinophilic fasciitis is occasionally associated with blood conditions such as aplastic anaemia or blood cancers like lymphoma and leukaemia. This is why doctors check your blood counts at diagnosis and during follow-up — not to alarm you, but to catch anything early.

Gentle, regular movement and stretching are encouraged to protect your range of motion, but build up gradually and avoid sudden very strenuous effort. The rehabilitation page has practical guidance.

Many people continue to work, sometimes with adjustments during flares. The work and insurance page covers documentation, time off and practical rights.

The support page lists patient organisations, and the stories page shares others' experiences. This site is written by a patient, not a doctor, so always discuss decisions with your own care team.