My kitten suddenly has a lump on the R side of her neck. I just noticed it since I was wiping her up earlier. Last night she was still frisky but now she seems to have a feeble meow. She's an indoor cat.

Do you have other indoor cats? Or any other indoor pet that she plays with?
Is it possible that she was rough housing or playing resulting in injury?

No she's my only kitten in here. At least her appetite is a bit better now. But the lump is still there.