In my opinion, you should not take the ai yet.
You're on a very low dose of test. Unless you're aromtatizing very easily, on 100mg a week you shouldn't need ai. especially splitting into daily doses.
Plus you're only a couple of weeks in. You should stick with one protocol for at least six weeks, get blood work, adjust from there. This is the typical procedure.
I'd say the itchy nip is coincidence. Our a bug bite