A spot appeared overnight on my left forearm. One morning there was nothing there; the next, there was a small, scaly, faintly-pink and slightly-raised patch.
I’ve always been vigilant about monitoring my skin for unusual spots since I have a family history of melanoma in addition to the fact that I’ve worked in the skin-care industry for the past two decades. I get annual skin checks, and I know the ABCDE skin cancer warning signs by heart… so I did what any person would do in 2026 and went down a ChatGPT and Google rabbit hole.
I managed to convince myself it was eczema—which usually presents itself in the form of patches of dry, itchy skin—based on internet photos and my general knowledge of skin conditions. But two days later, and after trying to slough off the scales with a gentle cleanser and towel, nothing changed. That’s when I started to wonder if it might be basal cell carcinoma—a very common skin cancer that’s usually treatable if caught early—and scheduled an appointment with my dermatologist right away.
“I have a weird spot. It came out of nowhere. I think it might be a basal cell… and my maternal aunt and maternal grandmother both died of melanoma,” I told the receptionist in a slightly panicked voice.
“We can get you in next week at our Santa Monica office.”
DONE. And I felt relieved given the usual wait time to see a dermatologist.
Well, turns out my ChatGPT diagnosis was wrong. It was neither eczema nor skin cancer.
The diagnosis, after two biopsies, two dermatologists, two pathologists and a referral to a cancer specialist, was cutaneous lymphoma—specifically mycosis fungoides, the most common form of cutaneous T-cell lymphoma (CTCL). It’s a rare blood cancer most common in men over 50. One that originates not in skin cells, but in immune cells that migrate to the skin and begin growing there.
As utterly shocked as I was to be diagnosed with a rare blood cancer at 42, I also knew that I was so lucky. My dermatologist caught something most people miss for years. And with any medical issue, especially with cancer, early diagnosis is key.
What Is Cutaneous Lymphoma?
To understand why cutaneous lymphoma is so frequently overlooked, it helps to understand what it actually is—and what it isn’t. I put that question to Christiane Querfeld, MD, PhD, a professor of dermatology and dermatopathology and director of the cutaneous lymphoma program at City of Hope Cancer Center in Duarte, California—the specialist who would ultimately confirm my own diagnosis.
“Cutaneous lymphoma is a rare type of cancer that starts not in the skin cells themselves, but in immune cells—white blood cells called lymphocytes—that travel to the skin and begin to grow there,” Dr. Querfeld explains. “So while it can look like a simple rash, it’s actually a cancer of the blood and immune system.”
That distinction matters enormously for diagnosis. Unlike melanoma or squamous cell carcinoma, which are caused by UV exposure, cutaneous lymphoma has no known environmental trigger. Researchers are investigating links to genetic factors and chronic immune inflammation, but there’s no sun-damage story to trace, no clear cause to point to. It primarily affects adults over 50, with a peak incidence in the 60s and 70s, and is slightly more common in men—though it can and does occur across demographics (clearly).
Because the cancer cells initially settle within the skin rather than forming distinct tumors, the body responds with local inflammation. That inflammation triggers the same redness, scaling, and intense itching typically associated with eczema or psoriasis. “In its early stages, the cellular patterns can look so similar under a microscope that even a biopsy cannot always distinguish cutaneous lymphoma from a benign rash,” says Dr. Querfeld.
