It is hard to see but every now and again snakes (in general) get bits of substrate under the scales. It causes irritation from the image it looks similar. Take a close look and see if it could be that.
I have had this every now and again I found a squirt of water directed at the lip of the scale (Sryinge) dislodges it.
It is just a guess on my part. You will need to take a close look for your self.
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