Markings on hazel

Markings on hazel

Observation - Markings on hazel. Description: Not sure if these are just mechanical damage (it was a fallen branch) but given how they move along the branch that didn't seem too likely. Any thoughts on what it could be?

Not sure if these are just mechanical damage (it was a fallen branch) but given how they move along the branch that didn't seem too likely. Any thoughts on what it could be?