I have a scar on my nasal dorsum from when I had a cyst back in 2017 which I burst. The scar is is like a donut shape - it is slightly indented in the centre where there is a pore and the surrounding tissue is slightly raised and discoloured a lighter shade (white). Are there any treatment options here? I have already tried multiple topical treatments including tretinoin, adapalene and azelaic acid (Finacea gel) with no improvements.