White Rock with growth

[Rudibell]

Just got my dozen chicks for this year

One of the White Rocks has a weird growth on the throat/neck area

They have NOT been vaccinated (vaccination could be the reason for swelling there...so that's not it).
Has anyone experience with this? The chick seems to be fairly healthy and is eating and drinking. Maybe she's not running around as much as the others...

UPDATE:
Chick is still happy and seems to unaware of the 'lump'. It's not hard, just feels like the rest of the chick. Any other opinions, besides a tumor? It's fine to leave it in with the others, right?

 

[debid]

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[Rudibell]

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[debid]

Is the lump hard to the touch? It is in the location of the crop which makes me wonder about the possibility of an impacted crop but I'd think the chick should be acting sickly by now if that were the case. The only other thing that comes to mind is a huge tumor.

 

[Rudibell]

Lump isn't extra hard to the touch, feels the same as rest of chicken. Since it's doing fine, could it just be a 'swollen crop'?