Uh yeah well I try anyway.
Worth removing? Burls, never. Other types of galls, yes, only If it seems it will advance and cause a lot of strength loss, yes. But these are rare--the kind Ekka posted pics of I *might* blast with a hose and scrub with a stiff brush and maybe dilute hydrogen peroxide, but it'd really be best to ID and observe it before going medieval on them.
Cankers, yes, If it seems infection will advance and cause a lot of strength loss. But smaller cankers can be excised, aka bark tracing--read Shigo et al on that.
