Not sure what you were using for a substrate, but, the photos to me look like irritation due the snake laying too long in overly moist substrate/maybe his own urates.
Since you were away for 2 weeks: it would not be a surprise.
As you suggested I would keep him on paper towels: dry and clean, but allow him to soak if he feels the need.
Also: I wouldn't handle the snake as the area is probably uncomfortable.
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