I really can't tell much from these pictures, & you have to realize that all creatures, whether human or snake, everything gets the occasional scrape or scratch from just living. Burrowing in substrate & against objects can certainly do this, & on a light colored snake, the evidence (minor damage) shows up easier.
If it's not spreading (getting larger or duplicating in other locations) I'd wait until after he sheds. It doesn't look like any broken skin (ie. not a risk for infection) so I wouldn't "soak him"- first of all, snakes usually dislike the the loss of traction when "soaked" & you sure don't want to risk him drinking the water with medication in it- so a BETTER way, IF you really want to do something, would be to use diluted* Betadine (*to light tea color) & dab that solution on the spots (use a cotton ball or Q-tip) several times a day. It absolutely won't hurt anything, & could help. But mostly, I'd wait for him to shed.
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