Trees, Shrubs and Conifers: canker on trunk: fix it or forget about it? , 1 by Muddy1

Muddy1 wrote:
When I bought it a year or so ago, I didn't notice that this Amelanchier arborea had a damaged trunk. lt looks like winter sun scald damage to me. I wrapped it this year to protect it, but I don't know what to do - if anything - about this canker. I read somewhere that it's best to cut the damaged area so that it heals.

The tree's about 5 feet tall and, except for this area near its base, it looks very healthy.