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A risk factor is anything that increases your chance of getting a disease like cancer. Different cancers have different risk factors. Some risk factors, like smoking, can be changed. Others, like your age or family history, can’t be changed.

But having a risk factor, or even several, doesn’t mean that you will get the disease. And many people who get the disease may have few or no known risk factors.

While most people with lymphoma of the skin may have some risk factors (such as their age or sex), in most people there is no clear cause of the lymphoma.

Older age

Age is an important risk factor for lymphoma of the skin.

• Most skin lymphomas happen in people in their 50s and 60s.
• But some types of skin lymphoma can appear in younger people, even in children.

Sex

Most (but not all) types of skin lymphoma are more common in men than in women.

Race

Most skin lymphomas tend to be more common in Black people than in White people. The reasons for this are not known.

Having a weakened immune system

Skin lymphomas appear to be more common in people with weakened immune systems.

This includes people with acquired immunodeficiency syndrome (AIDS), as well as people who’ve had an organ transplant (such as heart, kidney, or liver) who must take drugs that suppress their immune system.

Certain infections

Infection with certain viruses or other germs has been suggested as a possible cause of some skin lymphomas.

HTLV-1 virus

Infection with the HTLV-1 virus has been linked with the rare adult T-cell leukemia/lymphoma, although most people infected with this virus don’t develop lymphoma. This infection is most often seen in parts of Japan and the Caribbean.

Epstein-Barr virus (EBV)

Infection with Epstein-Barr virus (EBV) has been linked with some types of lymphoma, including extranodal NK/T-cell lymphoma, nasal type. But EBV infection is common, and most people infected with EBV do not go on to develop lymphoma.

Borrelia

In parts of Europe (but not in the United States), infection with Borrelia, the bacteria that causes Lyme disease, has also been linked with some skin lymphomas.

This link has only been reported in a small number of cases. Most people with skin lymphoma have not had Lyme disease, and most people with Lyme disease do not develop lymphoma of the skin.

Human immunodeficiency virus (HIV)

Infection with the human immunodeficiency virus (HIV), the virus that causes AIDS, may increase a person’s risk of skin lymphoma by weakening their immune system.

Some studies have suggested that infections with other viruses might also be linked with skin lymphomas, but more research is needed on this.