Looks like stuck shed on the tail, maybe multiple layers. Over time it can dry out, constrict the tail, cut off circulation, and cause an infection or necrotic tail.
Bump up the humidity and try soaking your snake to see if you can remove the stuck shed ASAP. Also make a vet visit, those red streaks look like the start of an internal infection.
Whenever your snake sheds always check the eyes and tail tip, those areas are critical.
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