Jiraiya was poisoned by a snake.
He had a gruesome-looking wound on his arm. Haku explained that it was caused by the bite of a giant snake carrying a virulent poison, which had already penetrated deep into Jiraiya's body. The poison in his blood needed to be cleared away in time for him to recover normally.
Fortunately, the freezing weather slowed down the flow of blood in the human body. Haku used his Bloodline Limit, employing a secret technique to freeze the blood in half of Jiraiya's arm, preventing the poison from spreading further into his body.
Chapter 126