Blister like bump formed after lip fillers (Photo)

I got my lips filled with less than 1ml of filler (unknown what kind). I noticed a blister like bump forming a few hours after the treatment. Two days after treatment it became more like a blister so I went to check with a doctor who didn’t inject it but was in charge of organising it. He told me it was like a blister that will go down. Three days on and the bump has not improved or worsened. It doesn’t hurt but it’s bruised.