Hello dear, The swelling around the knee is due to accumulation of fluid and blood (hematoma). The blood cells which gets accumulated are eventually broken down and absorbed in the body. But this is a slow process & takes times to disappear completely. Till that time, symptomatic relief is obtained by taking analgesic and anti inflammatory agents, ice compression & adequate rest. Motrin (pharmacologically Ibuprofen) acts as an analgesic and anti inflammatory agent & will provide symptomatic relief. However, if the symptoms still persist, then it will be better to consult your Physician. Investigations like X ray of the knee joint will be helpful to rule out any injury to the bone or soft tissues around the knee joint. There is no need to worry, you will be fine. Wishing you a good health. Thanks & take care.