I am sorry to hear about your husband.
That's so painful.
I am not a doctor, and not sure if this would apply much.
I tried tea tree oil on my burns (palm and fingers area) (I had some blistering, not bursted though). I just kept applying the oil on the burnt area every few hours, it healed quickly, no scars.
I hope you can get some qood advice here

Check into emu oil.

My son suffered 2nd and severe 3rd degree burns in an accident over a year ago. My heart goes out to you and your husband.

Dr. Christopher's makes an ointment that's supposed to be excellent for burns. Here's the story....

http://www.zhealthinfo.com/doctor.htm

Go down to the part that says 'burn paste.'

LisaG