I have studied your case,
Due to blunt injury
there can be hematoma
collection .The bleeding that occurs result in hematoma collection. Over a period of time, as hematoma resolves it cause local skin symptoms around the hematoma.
Continue ice application, and thrombhophobe ointment may help and take rest.
If required you may need to do blood investigation for prognosis and recovery.
Take precaution to avoid infection around hematoma.
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Wishing you good health.