This is often the case in accidents from lawnmowers, or some trees naturally shed their bark to reveal a lighter inner color.

An area on the outside of a tree trunk that appears to be stained white or looks wet during summer is likely bacterial ...

Bark stripping occurs most frequently in early summer. It can kill trees outright or make them susceptible to insect infestation or fungal pathogens. Squirrels prefer to strip bark from small trees ...