Do your daughters know the cause of your scars? Because if they do then you could possibly tell them the truth.
Are you having any support at the moment? If not perhaps, if you feel the sh is a (imminent) possibility a trip to your gp could be on the cards?
In regards to saying things to your daughters, would using dressings be an option, just something to cover the fresh ones, then you could say that you b**nt your arm on the oven or something along those lines?