Yоur pаtient is а 55 yeаr оld with h/о rheumatoid arthritis . He presents with a lateral forearm wound sustained while gardening one week ago. The wound measures 1.0 x 0.5 x 0.4cms with a 4 cm area of surrounding erythema extending towards his elbow. The wound is 50% granular and 50% slough. While probing, you find a 3.1 cm tunnel at the 12:00 that is draining a thick yellow fluid. The periwound area is indurated, warm to the touch and painful. What do you recommend to your patient?