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Well as you describe,it may be possible to have some soft tissue injury/swelling due to recurrent accidents on that same area.
It's good to apply warm compresses and do gentle massage on affected area for few days.
Also continue Motrin for next 2-3 days.
If such enlargement/difference persist along with pain more than a week then X-ray should be considered.
Wear ace bandage also.
Hope this helps.
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