my friend has a small, round, hard nodule approximately 3mm in diameter that is on the lateral aspect of her upper arm . She noticed it a few weeks ago, and it seems have moved about an inch more laterally since she first noticed it. no systemic symptoms, no fever, night sweats , nausea , or recent illnesses. She has been stressed at work from a move to new job. Past medical history of hodgkin s lymphoma survivor 7yrs prior (stage IIB nodular sclerosis) in remission without recurrence. any ideas?