Eastern redbud question

[Walnutseeker]

I have an eastern redbud planted 3.5 years ago. Tree seems to be doing great but I just noticed what looks like fungus in one of its crevices. Any idea what this is and, if so, what actions should I take to ensure the tree stays healthy?

 

[Raintree]

Leave it alone it's healing. Branch was pruned too close to the trunk. Little decay fungi growing in the dead tissue, not parasitic.