When you say raised scales, do they look folded? With large snakes and generally thick bodies snakes it is common to see lines of folded scales running from top to bottom of the snake at regular intervals. This is because the thickness of the snake causes the scales to fold when they coil and can leave a linear indentation. If the scales are flat but raised this is not the cause, but just for an example my ball python now weighs 600 grams (nearly a year old) and I am starting to see these folded scales from the pressure he puts on them while resting. He is not that large, so with heavy bodied pythons it seems to be a common thing even at a relatively small size. Pictures would definitely help determine the cause though. Also are the raised scales on his midsection or are they around his chin or face? I think I have read somewhere that mites can hide under scales causing a raised appearance and can be hard to notice if you don't know what to look for. Common areas for mites to hide are below the scales under their chin around their throat or around the eyes. It is also common to find them around their vents.
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