What should you know about cutaneous lymphoma?

It may involve T cells or B cells, and its behaviour can vary considerably. A diagnosis cannot be made from appearance alone because eczema, psoriasis, infections and other skin disorders can look similar.

Possible changes include persistent patches, raised plaques, lumps, widespread redness or itching. Some forms remain mainly in the skin, while others may involve lymph nodes, blood or internal organs. The lymphoma subtype and extent guide treatment more than the appearance of one lesion.

Assessment usually includes a skin examination and one or more biopsies. The laboratory studies the cells and may use additional marker or molecular tests. Blood tests, a lymph-node assessment and imaging such as PET-CT may be considered when the team needs to check beyond the skin.

Arrange a dermatology or haematology review for a skin change that persists, returns after treatment or steadily spreads. Bring photographs showing how it evolved, a list of medicines and skin products, and details of previous creams or procedures. Do not stop prescribed treatment unless the clinician advises it.

Treatment may be directed at the skin with medicines, light-based therapy or radiotherapy, or may work throughout the body with systemic medicines. The choice depends on subtype, distribution, symptoms, previous treatment and general health. More intensive cellular or transplant approaches are reserved for selected situations.

Contact your clinical team promptly if a lesion becomes rapidly larger, painful, ulcerated, infected or bleeds repeatedly, or if new lumps appear in the neck, armpit or groin. Fever, drenching night sweats or unexplained weight loss also warrant timely assessment. Seek urgent help for severe breathing difficulty, facial swelling or signs of a serious infection.

Ask for the exact lymphoma subtype, whether it is limited to the skin, which tests are still needed, and what the treatment aims to achieve. Also ask how skin symptoms will be managed, which changes should trigger a call, and how response will be monitored.