The symptom on the lower trunk seems to be Hypoxylon Canker, and if so, there is no treatment. More information about this disease can be found here, and although this particular article concerns oaks, it is applicable here as well: https://hgic.clemson.edu/factsheet/oak-diseases-insect-pests/

We recommend consulting an arborist who can assess the tree in person (if possible). You can use the second and third links on this page to search for one, if needed: https://extension.umd.edu/hgic/topics/how-do-you-decide-when-remove-tree

Miri