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This is Dr. David
this painful bump is most likely a small area of IV fluid infiltration into the soft tissue near the vein where the needle entered the vein
or it could be a small bruise from blood which leaked out after the IV was taken out.
how large is this bump?
usually using warm compresses or ice packs on the area can help decrease pain and swelling
and over time, the body can reabsorb the IV fluid or bruise in the area and it will get better.
let me know if you have questions.