probably hypermelanization. my mom had a pair of clowns and the female looked like that, so i eventually stumbled upon what black ich was and thought that was it. she eventually caught them and gave them to me (not a fan of the female biting her hands lol) to QT. after a couple rounds of GC what i thought black ich, humblefish suggested it's probably just hypermelanization. i've had them in a fish only observation tank for a month+ now and the spots are somewhat going away, although my understanding is they'll never completely go away as some of it is scarring.