lump on neck

Hellou, I have this ongoing battle with kittens skin. She first didn't have any lumps or bumps but they seem to come more and more often. I was thinking these marks come from rough play with other kitten so I started to clip their nails more often while these appear on the shoulders, neck and...

Hi I was wondering if anyone knows what this is on my 12 week old baby's neck ?? He's been home with us for a week now & I noticed it today. It's the size of a pea & I can move it around under his skin. He's not bothered by it at all, he's eating, drinking, playing & going to the toilet fine...