Blue spot puffer disease ID?

[NeiDan]

I've had this puffer about a month and only just noticed this today. It's still eating very well, no behavioral signs of stress. I'm thinking HLLE, but it'd be weird timing since I just started dosing food with Zoe + Selcon a couple of weeks ago. I also just added my first anenome, a rock flower anenome, possibly a sting? Tankmates: Engineer gobies, Yellow tang, Dwarf Fuzzy Lionfish, Marine Comet. Excuse my cyano outbreak.

 

[Mastiffsrule]

Evening

I would guess injury or abrasion. I would keep an eye on it for infection. I think the selcon and zoecon are good products to continue to use.

See if anyone else has some other diagnosis

 

[NeiDan]

Just wanted to update, the spot seems to have healed and he's doing well, must have been an abrasion or small infection.