When I took Kaa out of his tank to clean today, I noticed these pink patches around the upper half of his body. He's not acting out of the ordinary, just seems discolored near the head. I've taken a photo of the most obvious spot which is just behind his jaw. What is this? He ripped into a mouse pretty grotesquely last night (he didn't end up eating it, hence my taking him out today), so I thought maybe it's simply staining, but I couldn't wipe it off with a wet paper towel and it seems pretty pink.
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