Wounds in a dream usually point to past pain that's still tender, whether or not you've consciously been thinking about it. A wound that's healing can reflect real progress you've made, while one that reopens often signals vulnerability around something you thought was already fully resolved.
The lord of the second house hath the same strength in hurting, as the lord of the eighth; the lord of the sixth, the same with the lord of the twelfth. - William Lilly (1602.-1681.)