I think so. I know I have seen threads on the Emergency forum describing how to clean out the solid pus that birds/chickens have, so if after you remove the scab you have any questions you could post a query in that forum. If he will sit for it, warm salt water soaks using a cotton ball or similar may help loosen the scab and promote draining. I do not recommend hydrogen peroxide because it can damage healthy tissue.
Since his health is otherwise good, I don't think you are dealing with an active infection but rather the remains of his successful efforts to fight it.
Google search - what is pus made of?
https://www.google.com/search?q=wha...hrome.1.0l6.5718j0j7&sourceid=chrome&ie=UTF-8