If it was a bad shed that pulled an extra layer off on your boa's skin it would have healed the following shed. However, there have been cases like yours that have occured from food toxicity. Yes, certain suppliers of rats have been known to cause similar problems in boas. In a few cases death. This has been showing up more and more in boas and ball pythons where the color disappears in areas either partially, or becomes white. Rat toxicity and a certain bacterial infection I do not recall the name of, are both linked to it.

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