What are lymphoid aggregate? To worry?

My diagnosis now is 1) Terminal ileum: Focal active ileitis with lymphoid hyperplasia. II) Right colon: Mild active colitis with increase in lymphoplasmacytic infiltrate. III) Transverse colon: Mild active colitis with increase in lymphoplasmacytic infiltrate. IV) Left colon: Mild active colitis with increase in lymphoplasmacytic infiltrate. V) Rectum: Mild active proctitis with increase in lymphoplasmacytic Infiltrate. VI) Antrum: Moderate chronic gastritis with mild focal activity. VII) Body: Mild chronic gastritis. Overall histomorphological features, in correlation with endoscopic findings, favour possibility of -Lymphocytic colitis. Before this diagnosis earlier biopsy result told I have uc. Now this . -IHC (4 antibody) may be done to know the nature of lymphoid aggregates. What are this lymphoid aggregate? IHC test is taking long what may be the cause. When I asked the hospital they said they need to consult with other histopathologist. Is this something to worry?