Season 1 Ep.40. This is the gash sustained
to Ryan's head after Salene bit him on the arm, and he fell. She does
her best to clean it, but it still looks pretty bloody when they find
the stray piglet on their way back to the Mall.
Then all the blood disappears while they are walking with the pig
- at about the same time as Salene's
hairpins change back.