Full thickness wounds
Immediate excision and skin grafting give good results in the long run. Donor skin may be taken from, other unaffected areas, from a relative, from skin banks or from the skin of pigs which are normally compatible with human skin (xenograft).
General treatment

Relieve pain with intravenous pain relievers or local anaesthetic creams

Fluid replacement into the body to compensate the fluid loss

Therapy to combat infection that can occur in the burnt area

Anti microbial therapy

Nutritional support
BTW, I never saw blisters turning black before... it was quite alarming. Oh, and after I removed the top blackened skin, there was no bleeding or anything, just brownish residue I believe to be skin cells.