Cornell, welcome to the Do-It forums. It would have been a sweeter entry had you not done so half cooked.
I think we all have war reminders in the form of scars from burns and at times I wonder if it isn't just part of the learning curve with the plastic cooking and injection. I too tried to inject using an injector that was not specific to this plastic and managed to re-decorate the kitchen walls, the stove, the refer, a large portion of floor, the front of all of the clothes I was wearing and of course my hands and neck. 1st, 2nd, and a couple small areas of third degree burns were my companions for several weeks while things healed up. Today whenever I am showing anybody how the injection process works, they see the scars before they see anything and get the schpiel on plastic temperature while they think about the scarring. You're not alone and we all feel your pain. We're all going to tell you to use the proper equipment too....and that means using an injector designed to use using this plastic, not a meat injector.
Keep those burns clean and loosely covered. Serious burns take some time to heal and if you take care of the affected area you'll be fine.
Again, welcome aboard!