San Pedro Cactus - Markings on the Cactus not sure what is causing it

Greetings to my fellow cactus enthusiasts

I've been growing my San Pedro now for over 14 years and in the past year I'm starting to see markings all around the cactus which wasn't there a year ago
Is it a disease, or insects eating away?
Does anyone have a solution to the problem.
Any help would be greatly appreciated as this cactus means a lot to me.

Hmmm ... looks like insect damage more then a disease. But its hard to say. Normally bugs hit the growing tip rather than the sides. Maybe slugs or snails?

I'd call that mechanical damage where the stems have rubbed together during windy days. I've got exactly the same on taller stems that grow close together.

Yeah I think Snowfella is on the right track. Some of it is caused by the spines of the other branches rubbing to gether. Not sure about the other areas not near another branch.

Thanks for the replies.

That's what I was leaning towards as well. It's a little odd with the scars that are not close to one another but they appear to be older scars.

Just stunning these cactus's