Hello XXXXXXXXXXXX,
Thank you for asking your question on Just Answer.
How large/old is the tree?
What is your location?
What side of the tree is the area that is splitting?
How large is the split?
How long has the split been noticeable?
Thank you again for trusting us with your problem. Please reply as soon as possible so that we can finish answering your question.
Bark splitting can be caused by many different things Some examples are herbicide damage, freezing temperatures, growth cracks, fungus, diseases or lightning injury. If the damage is only on the south side of the tree it is most likely sun damage.White latex paint applied to the tree trunk will keep this from happening. Do not use anything to cover the area where the bark is gone. It will only be a place for insects to hide. Trim away any loose bark and the tree will heal itself. More information can be found here.
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Handyman
Handyman, Master Gardener, Plumber, Electrician, and Electronic Technician