Really positive idea to explore different communication methods. It will be vital to give lots of reassurance, especially due to the location of the wound on the body, and an appropriate chaperone (with consent) could be considered.
Communication must be empower Farhan and appropriate for his level of understanding.
Assessment of the wound needs to be holistic and include intrinsic and extrinsic factors including things like diet and stress and following up the care plan for his raised HbA1c and ongoing diabetes management.