<prompt> According to rule of nines, burns involving perineum are:191827  <response>: Burn Size BSADetermination of burn size estimates the extent of injury.Burn size is assessed by Wallace rule of nines By Alfred Russel WallaceWallace Rule of Nines:In adults:- Each upper extremity: 9- Head and neck: 9- Lower extremities: 18- Anterior and posterior aspects of the trunk: 18 - Perineum and genitalia: 1Children have a relatively larger proportion of body surface area in their head and neck, which is compensated by a relatively smaller surface area in the lower extremities. - In infants: Head and neck- 21; Each leg-13Berkow formula is used to accurately determine burn size in children.For estimating smaller burns: Area of open hand including palm and extended fingers of the patient is approximately 1 of TBSA.This method is helpful in evaluating splash burns and burns of mixed distribution. 