Dog faced puffer, external red spot

Mattwhaleyuk

New member
I picked up this guy yesterday from the LFS
They held him for the last 3 weeks for me on account of him not feeding.
He was housed in a tank in the top shelf of the store, so whilst I could observe his behaviour (and he has calmed down in the last 3 weeks) I didn't notice this spot on his side.
Since putting him in my tank, he's become more lively and even ate a little yesterday and today but I'm worried about this red spot on his side.
Don't really want to stress him further if possible does anyone know -

A.) what this is

And

B.) what I should do about it

Never had any disease or infections in a marine tank before so this is first for me.
 

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I wouldn't worry about it for now. Puffers tend to get bumps like that from time to time, at least mine does.
 
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