Herpes doesn’t cause numbness like this. And any herpes test that you had done this soon to detect infection won’t be accurate yet. And certainly, herpes would not be causing a sensation in your arms and tips of fingers. Have you ever in your life had a cold sore on your lip? If yes, then this is the type of herpes we worry about when receiving oral sex and if you’ve had it orally, then you are very unlikely to get it genitally.