Hyacinth bark loss
These look like lilacs.
The first photo shows small patches of bark loss, which is typical work of the European hornet. This non-native hornet scrapes off bark to get to sap. It particularly likes lilacs.
Here is info about this situation:https://extension.umd.edu/hgic/topics/european-hornets Be careful around them, they have a nasty sting.
They tend to go for the older branches of lilac. Since lilac produce new suckers each year, it's not a bad idea to prune out a few of the oldest branches each spring after they bloom.