There are different types of lymphomas, and a skin rash or itchy skin is a typical symptom of adult non-Hodgkin lymphoma, according to the National Cancer Institute. Rashes commonly occur in skin lymphomas as purple or red scaly patches resembling eczema, expanding as the lymphoma develops, states Healthline.
An enlarged lymph node is usually the first sign of a lymphoma. Symptoms such as chills, night sweats, fatigue and weight loss also indicate lymphomas, explains Healthline. A rash and other symptoms may occur for reasons other than adult non-Hodgkin lymphoma. As of 2015, doctors use various methods to diagnose the disease, such as testing blood thickness, examining bone marrow samples and measuring antibodies in the urine, according to NCI.