"bump" on my yellow headed jawfish

[Mark9]

You can clearly see it in the picture.
Came from the lfs this way, did not notice it in the store, as he was hiding.
Eats fine, gets along with the other fish in my isolation tank.
Been maybe 2 weeks, no change in the bump.
Parasite?
Is he in danger?
Just what should I do?

 

[Mark9]

Should have read the sticky...

1. How old is this aquarium?
Bought it established, i've had it for 6 months, at least a year old

2. If less than six months old, what is ammonia level?

3. What is SG of this aquarium? How measured?
1.026

4. When was the last fish added to this aquarium?
arund 2 weeks ago, this fish

5. Was it quarantined? If so, how? And how long? Was it prophylactically treated? How?
this is the isolation tank, no medications

6. If you are using a copper based medication, which one? How often do you measure level? When?

7. If you are using hyposalinity, how did you calibrate your refractometer?

8. Please describe in detail, the appearance of the fish? If there is one or more pimples, are they lumpy? What color?
bump, as pictured

9. Please describe the behavior of the fish as best you can. Is it acting reclusive? Is it always up towards the top of the aquarium? Is it avoiding light? How active is the fish?
fish acts totally normal

10. Is the fish eating? What?
eating mysis, larry's reef frenzy, any meaty food. doesn't like flakes. eats like a pig.

 

[Mrscribbled]

I'd rule out any kind of parasite. Just monitor it and if it progressively gets worse, it may be a tumor. Could also be an old injury.