Your follow-up question should have been posted here; I deleted your new question. Only a limited number of new questions can be accepted, and excessive ones block others with their own questions.
No STDs are ever transmitted by kissing. You were not at risk for any infection from this exposure.
Welcome to the forum.
STDs are rarely transmitted by fingering. The only cases I have ever heard of involved open sores that got infected with HSV or gonorrhea, and even those are rare; in 4 decades in this business, including 30 years in a busy STD clinic, I saw exactly one case of each. If your blister was intact, there was no risk at all. Even if you had an open sore, I would not recommend doing anything unless you developed an apparent infection at that site -- i.e. if in the past 2 weeks the blister/sore has healed, with no continuing sore with pus and redness, you can safely conclude you were not infected.
In other words, no appreciable risk and no need for testing.
Regards-- HHH, MD