Wound with bloody discharge belongs to which grade as per Southampton wound grading system

Southampton wound grading system for healing and injection : Grade 0 is normal healing. Grade 1 is with bruising / mild erythema. Grade 2 is severe erythema with other features of inflammation at or around wound. Grade 3 is serous or bloody discharge. Grade 4 is presence of pus or deep infection or tissue break - down or significant haematoma.