Cutaneous Lymphoma
Also known as: CTCL / Mycosis Fungoides
Cancer of immune cells affecting the skin. Early stages look like eczema or psoriasis, making diagnosis difficult.
What to look for
Side-by-side comparison
Normal skin
No persistent patches
Possible CTCL
Persistent patches, steroid-resistant
Cutaneous T-cell lymphoma (CTCL) is a group of cancers that originate in T-lymphocytes (immune cells) and primarily affect the skin. The most common form is mycosis fungoides, which accounts for about half of all cutaneous lymphomas.
Mycosis fungoides progresses through distinct stages. In the patch stage, it appears as flat, scaly, reddish patches that closely resemble eczema, psoriasis, or fungal infections - leading to frequent misdiagnosis for years. The patches typically occur in sun-protected areas (buttocks, trunk, upper thighs), which helps distinguish them from sun-related conditions.
In the plaque stage, the patches thicken and become raised. In the tumor stage, dome-shaped nodules develop that may ulcerate. Sezary syndrome is an aggressive leukemic variant where malignant T-cells circulate in the blood, causing widespread skin redness, severe itching, and enlarged lymph nodes.
Early-stage mycosis fungoides has an excellent prognosis - many patients live decades with appropriate treatment. Advanced stages carry a worse prognosis and may require systemic therapy.
Quick self-check
Does this look like cutaneous lymphoma? Answer 2 questions.
Do you have persistent patches that have not responded to typical eczema or psoriasis treatment?
Are the patches mainly in sun-protected areas (buttocks, trunk, upper thighs)?
Risk factors
- Age 50-60 (most common at diagnosis)
- Male sex (2:1 male-to-female ratio)
- No clearly established environmental risk factors
When to see a dermatologist
- ⚠Persistent flat, scaly patches that do not respond to eczema or psoriasis treatment
- ⚠Patches in sun-protected areas (buttocks, trunk) that have lasted months to years
- ⚠Progressive skin rash with intensely itchy skin and enlarged lymph nodes
Often confused with
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Full ABCDE check →Frequently asked questions
Can mycosis fungoides be mistaken for eczema?
Very commonly, yes. Early mycosis fungoides closely mimics eczema, psoriasis, or even fungal infections. The average time from symptom onset to correct diagnosis is approximately six years. Persistent patches in sun-protected areas that do not respond to standard treatment should prompt a skin biopsy.
Is cutaneous lymphoma curable?
Early-stage mycosis fungoides (patches and thin plaques) can often be managed effectively for decades with skin-directed therapies. It may not be curable in the traditional sense, but many patients live a normal lifespan. Advanced stages are more serious and may require systemic treatment.