Non-Hodgkin’s lymphoma most commonly looks like a painless, swollen lump under the skin, typically on the side of the neck, in the armpit, or in the groin. These lumps are enlarged lymph nodes, and they tend to feel soft, rubbery, and moveable rather than hard or fixed in place. But NHL can also show up on the skin itself, on imaging scans, and through whole-body changes that alter your appearance over time.
What the Lumps Feel Like
The most recognizable sign of non-Hodgkin’s lymphoma is a swollen lymph node you can feel as a bump under the skin. Eric Jacobsen, clinical director of the Adult Lymphoma Program at Dana-Farber Cancer Institute, describes these lumps as painless, moveable, and having a soft, rubbery texture. That’s different from what most people expect: a cancerous lump doesn’t necessarily feel hard or painful. In fact, the lack of pain is part of what makes lymphoma lumps easy to dismiss.
The most common locations are the sides of the neck (cervical nodes), the armpits (axillary nodes), and the groin (inguinal nodes). You might notice just one swollen node or a cluster of them. Some people discover them while showering or getting dressed. Others notice them only when a lump grows large enough to be visible in a mirror.
How quickly these lumps grow depends on the type. Follicular lymphoma, the most common slow-growing form, may produce nodes that stay the same size for months or even years, sometimes shrinking and then swelling again. Diffuse large B-cell lymphoma, the most common aggressive type, grows quickly and can cause noticeable swelling within weeks. A lump that appears suddenly and keeps getting bigger warrants prompt attention.
Skin Changes in Cutaneous Lymphoma
Some forms of non-Hodgkin’s lymphoma start in or spread to the skin, creating visible changes that can be mistaken for eczema, psoriasis, or a persistent rash. The most well-known skin lymphoma, mycosis fungoides, typically progresses through distinct visual stages.
Early on, it appears as flat patches of scaly, reddened skin with a distinctive wrinkly texture sometimes described as resembling cigarette paper. These patches tend to be round or oval and can show up anywhere on the body, though they often favor areas not regularly exposed to the sun. As the disease progresses, the patches thicken into slightly raised plaques that feel firmer to the touch. In later stages, actual tumors can develop as dome-shaped nodules that look shiny and may ulcerate if they grow large enough. Infection of these open sores is common.
Another skin form, primary cutaneous anaplastic large cell lymphoma, usually appears as one or a few firm nodules or plaques, particularly on the arms or legs. These can look shiny and purplish (what dermatologists call violaceous) and may ulcerate or sometimes resolve on their own before returning.
More aggressive skin lymphomas can look dusky, dark red, or hemorrhagic, with individual lesions that ulcerate and spread rapidly across wide areas of skin. The key feature that distinguishes lymphoma skin lesions from benign rashes is persistence: they don’t respond to typical skin treatments and either stay the same or worsen over weeks and months.
What NHL Looks Like on Imaging
On CT scans and MRIs, non-Hodgkin’s lymphoma has a distinctive appearance that helps radiologists tell it apart from other cancers. Lymphoma masses tend to look unusually uniform and smooth. Unlike many solid tumors, they rarely contain calcium deposits, internal bleeding, or dead tissue at the center. They appear as bulky, well-defined masses that wrap around blood vessels without actually squeezing them shut, a hallmark feature.
When lymphoma involves organs outside the lymph nodes (called extranodal disease), it can appear in the throat, sinuses, stomach, intestines, or bones. In bone, it typically creates a moth-eaten pattern of destruction rather than a clean break. In the head and neck, it shows up as a smooth, well-bordered mass that conforms to surrounding structures rather than invading them aggressively, which helps distinguish it from other cancers in the same location.
If your doctor mentions “bulky disease,” they’re describing a lymphoma mass that’s particularly large on imaging, often 10 centimeters or more. This is visible on scans as a dominant mass, sometimes in the chest or abdomen, and can cause symptoms from pressing on nearby organs.
Whole-Body Changes You Can See
Beyond lumps and skin lesions, non-Hodgkin’s lymphoma can cause systemic changes that alter how you look and feel. The classic trio, known as B symptoms, includes fevers, drenching night sweats (soaking enough to require changing clothes or sheets), and unintentional weight loss of more than 10% of body weight over six months. Persistent fatigue and chills round out the picture.
Visible weight loss is one of the more noticeable signs to friends and family. It happens without any change in diet or exercise and can progress quickly with aggressive subtypes. The combination of weight loss, fatigue, and pallor can make someone with advanced lymphoma look noticeably unwell, even before a diagnosis is made.
Swelling in the abdomen can occur when lymphoma enlarges the spleen or liver, sometimes enough to be visible as a distended belly. In rare cases, lymphoma in the chest can cause visible swelling of the face, neck, and arms if it compresses a major vein.
Under the Microscope
If you’ve had a biopsy, your pathology report describes what the lymphoma cells look like under magnification. The two most common patterns are follicular and diffuse. In follicular lymphoma, the cancer cells cluster into roundish structures that resemble the normal architecture of a healthy lymph node, with clearly separated, round groupings of cells. In diffuse large B-cell lymphoma, the cancer cells spread in an even sheet across the tissue, erasing any normal structure.
One key detail in the pathology process: non-Hodgkin’s lymphoma is partly defined by what it is not. Hodgkin lymphoma is identified by the presence of specific giant cells called Reed-Sternberg cells. NHL lacks these characteristic cells, though occasionally look-alike cells can appear and require careful testing to confirm the correct diagnosis.
Who Gets It and When to Pay Attention
Non-Hodgkin’s lymphoma is not rare. An estimated 80,350 new cases will be diagnosed in the United States in 2025, and roughly 835,000 Americans are currently living with it. About 2% of people will be diagnosed at some point in their lifetime. The median age at diagnosis is 68, with nearly 80% of cases occurring in people over 55.
That said, it can happen at any age. About 10% of cases occur in people under 45. Because the most common early sign, a painless swollen node, is also an extremely common response to routine infections, context matters. A swollen node from a cold or minor infection typically shrinks within two to three weeks. A lymphoma node persists, gradually grows, and doesn’t respond to antibiotics. Multiple swollen nodes in different body regions, or a node combined with B symptoms like drenching night sweats and unexplained weight loss, raise the level of concern significantly.