Lump on my Ck's Chin?

I posted a question about this in my other thread, but I figured it would be better to start a different thread for this problem.

I just got my clown knife earlier today, and he's between 9-11 inches, I haven't officially measured him yet, since he's settling into his new home.

But I noticed when we got him, that he has a largish lump on his chin. I took a picture of it, and I will be posting it here. But, I need to know what this thing is, and if it's potentially hazardous to Buddy's health.

Oh BTW, I think I may have found out why he's so small.....he was in a 35 gallon Hex tank!!

I will add the pics on later, since they are taking way too long to upload.

Thanks in Advance

Sushi

Here's a pic of that lump


I should've circled it or something, but if you start at his bottom lip and go back a little bit, you should be able to see it.

Hopefully it's clear enough that someone can help me

Thanks

Bjorn, nice avi (that's my profile pic)!!

It pretty much just bobs up and down when he breathes, whenever he moves that section of his throat.

I'm glad to hear it's nothing major and life-threatening. He's still eating fine, I have some tiny minnows in his tank and he was attempting to hunt them last night. It was funny to watch.