Hen plucking feathers and hard mass on chest

[TeriTN]

My 1 yr.old leghorn/hybred hen has plucked the feathers off of her right side.

There seems to be a hard mass under her skin. When I touch the mass
it moves around.

She has clear, clean eyes, and bright red comb, normal poop,
and lays an egg daily.

Could this be some tumor under her skin?

 

[birdicus7]

This mass you are referring to...right breast area? That is probably her crop. It will fill up each day as she eats and if you check her in the morning it will be nearly empty if not empty. You state she is 1 year old, she could be due to molt and may very well be doing so. All other indications you give are of a very healthy hen. (You may want to do a thorough check for mites but I suspect everything is fine with her. Good luck!