New ball python blood on paper towel

[Bogertophis]

Presume it’s not just some blood from a mouse / rat after feeding ??

Last thought ... could be a little nick/cut on the side of the snake ??
Maybe just check the snake carefully and/or check the viv /tub for any sharp edges or corners ..


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I don't think so, that looks like a bit of blood in a bit of mucus to me, which likely came from (inside) the snake's cloaca, IMO.
As Deborah alluded to in above post, if she shed recently, sometimes that will cause this. But not always, OP is right to be concerned
& watchful.