Brent,
generally you want to do your formative - shaping pruning in the winter
as you have read. It is too late for that now. Looking at your
pictures there is no hurry as they are in reasonable condition - appart
from the distortion on the bark. You may want to undertake some summer
pruning to encorage fruiting come August.
To me it looks like canker that has been treated. Someone has used a
knife to cut away the diseased tissue and this is the callus that has
formed as its healed.
Clifford
Bawtry, Doncaster, South Yorkshire