Read the manga
the arking was for the summoning
they are not SM markings,,, May be he need those to summon Ma and pa
mostly likely due to him being a imperfect sage, the markings are probably there to stop him from fulling turning into a frog.
The thing I find funny is that Jiraiya's SM had more benefits, despite being imperfect.
The thing I find funny is that Jiraiya's SM had more benefits, despite being imperfect.