Never Seen Before: Close-Up Of The Joestar Birthmark
Excluding birthmarks on certain guys in part 6. And sbr, jjlion, jjland. Who's woman at top left? 741 votes, 24 comments. 865k subscribers in the stardustcrusaders.
Its just arakis mistake, josuke is meant to be the union of kira who is a joestar by blood (johnnys descendant) and josefumi who is a jojo (from his name). The birthmark only appeared after dio awakened his stand, thus awakening those of the other joestars. This explains why jotaro and holly never noticed their birthmark, and also why it.