Non-Hodgkin lymphoma (also known as non-Hodgkin’s lymphoma, NHL, or sometimes just lymphoma) is a cancer that starts in white blood cells called lymphocytes, which are part of the body’s immune system. NHL is a term that's used for many different types of lymphoma that all share some of the same characteristics. NHL usually starts in lymph nodes or other lymph tissue, but it can sometimes affect the skin.
B-cell lymphoma refers to types of non-Hodgkin lymphoma that are characterised by abnormalities of the "B cells" (a type of white blood cell that makes antibodies to help fight infection). The condition may grow and spread slowly with few symptoms (also known as indolent lymphoma) or may be very aggressive with severe symptoms.