Open Rhinoplasty Tip Redness - 6 months post-op. (photo)

I had open rhinoplasty 6 months ago whereby my own spare cartilage from my nose was used along with fascia from my scalp. Part of the graft on the tip became infected & eventually had to be removed 3 weeks ago. I did suffer a Haematoma. I now have persistent redness on the tip of my nose which isn't showing any sign of improving which is worrying me. I only had a very tiny area of redness around the infected graft prior. Can anyone explain what's going on and how to treat this? Thank you