I'm sure F won't be too worried about a small cut in his mouth, TSC. But you have my sympathy for the awful knowledge that something you did caused minor harm. It's a horrible feeling! Though I doubt he'll be holding it against you. :) Hopefully the steroids will help.
My week/month is still not improving.
M spontaneously came out in a rash on her torso yesterday, that I put down to a reaction with some new vests I got her that she was wearing one of for the first time. I resolved to wash them another couple of times to make absolutely sure the chemicals were gone and dressed her in her older things this morning.
However I got the dreaded call from Nursery earlier, that the rash had gotten worse, M was out of sorts and they were worried she had measles.
Took me three tries and about half an hour to get hold of my bloody doctors surgery for an appointment.
Then mobilised DH to race out of work and take M in his lunch hour, hoping it was just a mild allergic reaction or some such. Doctors surgery kept DH and M in an excluded side room at the surgery for an hour until she was seen! 
Found out M doesn't have measles, but does have a viral rash and needs to be kept at home, away from people, until the rash fades.
DH and I each have half a day of holiday each remaining this year (DH is taking his currently) and we can't afford to take parental leave!
Several plaintive calls later, DH's parents are driving 100 miles and coming to stay with us for the rest of the week and I'm (currently in the process of organising) working from home so I can at least cook the meals and change the smelly nappies.
Annoyingly, when I called nursery to let them know, they said that they'd ordinarily still take kids with a viral rash (probably why M has it in the first place...). However because the doctor has said M has to be kept away, they have to abide by that.
[weeps] Does someone want to swap lives with me for a bit so I can have a nice, quiet, boring week where nothing breaks and everything runs smoothly??