What is Cutaneous Lupus Erythematosus?
Cutaneous lupus is lupus that affects mainly the skin. It produces sun-sensitive rashes that can scar and cause permanent hair loss if untreated. Most people with cutaneous lupus never develop systemic disease, but a proportion do, so assessment includes checking whether other organs are involved.
Also called: Skin lupus, discoid lupus
Who gets Cutaneous Lupus Erythematosus?
It affects women more often than men and can begin at any adult age. Smoking makes the disease more resistant to treatment and is strongly associated with the discoid form. Sun exposure is the main trigger, and in India the discoid form is frequently seen on the face and scalp in people with substantial outdoor exposure.
What are the symptoms of Cutaneous Lupus Erythematosus?
Not everyone has every symptom below, and having one does not confirm the diagnosis. These are the features that most often lead to assessment:
- Round, scaly, coin-shaped patches on the face, ears or scalp that may leave scarring and permanent hair loss (discoid lupus)
- A butterfly-shaped red rash across the cheeks and nose, sparing the folds beside the nose
- Ring-shaped or scaly patches on sun-exposed areas of the neck, chest and arms (subacute cutaneous lupus)
- Rashes that appear or worsen days after sun exposure
- Colour change in healed patches — lighter or darker than surrounding skin
- Mouth or nasal ulcers
- Hair loss, patchy or diffuse
How is Cutaneous Lupus Erythematosus diagnosed?
The appearance and distribution of the rash is usually characteristic. A skin biopsy confirms the diagnosis and distinguishes the subtypes, which behave differently.
Blood tests look for ANA and specific antibodies — anti-Ro/SSA is strongly associated with the subacute form and matters in pregnancy because of the risk of neonatal lupus.
A systemic assessment is always done: blood counts, kidney function and urine testing, to establish whether this is skin-limited disease or the first visible sign of systemic lupus.
How is Cutaneous Lupus Erythematosus treated?
Rigorous sun protection is the foundation and is not optional — daily broad-spectrum sunscreen, hats, and avoidance of midday sun. Without it, other treatments underperform.
Topical corticosteroids or calcineurin inhibitors treat individual lesions. Hydroxychloroquine is the main systemic treatment and is effective for most patients, though it takes two to three months to work.
Resistant disease may need methotrexate, mycophenolate or thalidomide-class drugs.
Stopping smoking measurably improves the response to hydroxychloroquine, and discoid lesions in smokers are notably harder to control.
Living with Cutaneous Lupus Erythematosus
Scarring lesions on the scalp cause permanent hair loss once established, so treating early matters more here than the severity of symptoms might suggest. Long-standing discoid lesions carry a small risk of skin cancer developing within them and should be reviewed if they change. Around 5 to 15 per cent of people with discoid lupus go on to develop systemic lupus, so periodic blood and urine checks continue.
When should you see a rheumatologist?
A persistent scaly facial or scalp rash, a rash that flares after sun exposure, or patchy scarring hair loss should be assessed. Early treatment prevents permanent scarring.
Common questions about Cutaneous Lupus Erythematosus
Will skin lupus turn into systemic lupus?
Usually not. Around 5 to 15 per cent of people with discoid lupus develop systemic disease. Periodic blood and urine testing is done so that any systemic involvement is picked up early.
Will the scars go away?
Scarring from discoid lupus is permanent once established, including hair loss on the scalp. This is why early treatment matters — the goal is to stop new lesions before they scar.
Why does my doctor keep asking me to stop smoking?
Smoking makes cutaneous lupus significantly more resistant to hydroxychloroquine, the main treatment. Stopping measurably improves the response.
This page is general information to support a consultation. It is not a diagnosis, and it does not replace an assessment by a doctor who has examined you.