The infiltration happened a few days back. I put ice on it after it happened. I was hoping it would have gone away by now but it's still there. Oddly enough I don't really bruise when they infiltrate me.
For me if it is what I call a gooseegg it could take over a week to go away and I get delayed bruises. But you say it is flat? I don't know exactly what it is. Have you tried asking the nurse? Techs? Nephrologist?