If your burn is nasty, there's some really good cream from the pharmacy - Accriflex (red tube). It is really good for cuts and grazes, but brilliant for burns. We have a log burner in our lounge and one night I had put some logs on and shut the door, but a gust of wind down the chimney made the door fly open again right onto my arm - it stuck and was VERY nasty, but was recommended this by the doctor and I won't be without a tube in the house now
You take care with that iron, it's obviously got a grudge against you - are you using it too much at the moment!