Hello, I'm A Massage Therapist With A Client That Has

Hello, I'm a massage therapist with a client that has had fatty like tumors appear on his arms. He said his doctor said they were benign fatty tumors. That it would be ok to get massages from me still. I don't want this to be a problem and I'm worried it may be a problem with his lypmh system! I could cause more damage. Can you massage someone with lipomatosis? It's just on his arms. What do you suggest?