What are these 2 small gray stripes on my hippo?

[Makubex]

It looks like hhle but I doubt it (he has hhle on his face but that was from the previous owner), its on his black stripes, any fish medics please help

125 with live rock

It eats nori with selcon, also eats fish pellets dipped in selcon

Tank mates:
7" foxface
3.25" picasso triggerfish
Pair of clowns
4" sailfin tang

 

[Sean Clark]

Looks like a little battle damage from the sailfin. Noting to worry about.

 

[Makubex]

Oka