Japanese Cherry Tree Bleeding

Its hard to say exactly what’s caused this damage and bleeding, but its possibly Peach Tree Borer. This link has good info: https://tl2q-xvdj.accessdomain.com/webmail/index.php/mail
or it could be a symptom of canker caused by a disease, but we can’t say for certain what disease. Disease diagnosis often requires a pathological examination in a lab. The link at the end of this message explains the difference between usual location of borer damage on a tree & canker symptoms, but in addition we recommend you show this photo and any other evidence you can gather, to a local arborist, university extension “tree advisor”, Master Gardener group, or some other professional available in your area: http://www.walterreeves.com/landscaping/bleeding-cherry-tree-gum-on-bark/