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You seem to have developed thrombophlebitis and swelling following IV cannula/ needle insertion.
However, this swelling goes away by itself with 2-3 weeks.
Still, if you are having any pain or inflammation, i would advise you following:
1. To apply Thrombophobe ointment locally
2. To do cold fomentation of the affected area.
This swelling will start regressing and would eventually go away.
I hope it helps.
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