she'd have to have active herpes lesions on her hands in order for you to contract herpes from a hand job.
You could in theory contract hpv or molluscum since they can be present under the nails. Also some bacterial skin infections you can contract. That all said - the risk from a hand job is just way too low to worry about. No need for testing for anything.
grace
what if she has herpes or warts? Can I get those?
thanks
No risk for a "Disease" No need to worry about testing.