Burn (even superficial burn) of  40% and above are life threatening. Your father needs aggressive management with hospital admission, iv fluids, iv antibiotics and other medications. Septisemia is also very common in burn patient because the protective layer of skin is lost. Hence maintenance of asepsis is of critical importance.

He need IV antibiotics, fluids and other symptomatic medicines such as pain killers etc.

Your father will need IV antibiotics,fluid management, correction of electrolyte imbalances if any and depending on the severity of symptoms ICU admission and close monitoring might also be required

Need to evaluate further kindly consult me

Consult gen surgeon

Kindly consult