My 9 yr old son have some swelling above his right elbow and below the triceps. Not too much pain except when pressing hard or trying to bend the elbow completely on 0 degree. USG report says "Large lobulated subcutaneous fluid collection measuring 3.9*1*2.4 cm noted above elbow postero-laterally with internal echoes. No calcification/internal vascularity. Minimal overlying probe tenderness noted". Please suggest me if its a minor issue and what is the next step to cure it.