Logan, I hope you are feeling better soon.
I have followed your posts about Butter and the scratches he can give you on a moment's notice. When Rascal entered my life, he too, was "quick pawed". He was about a year and a half when he showed up and somebody has done something to him to make him very cautious about where you touch him. He always wants to know where your hands are......and as if in anticipation of you hitting him he strikes out first. It has taken a long time to get him over that. The only thing I knew to do is to keep saying
"NO" in a loud voice to him and then leave him alone....ignore him.

Now, it is very rare that he does it with me, but I have to warn strangers. Rascal is very very friendly, but if he feels threatened by a stranger he can still lash out.

I hope the lump just disappears, but keeping a close eye on it is a good idea. Hope he doesn't have to visit the "white coats"
as Phred says.