Phagocytosis is a process by which the body destroys dead or foreign cells through engulfing and ingestion by phagocytes like macrophages. Hodgkin's disease is a type of lymphoma cancer that affects lymph tissue and commonly causes swollen lymph nodes, while sarcoidosis is an inflammatory disease of unknown cause that can affect multiple organs, most often the lungs, skin and lymph nodes, with varying symptoms depending on the affected organs.