Well, barring some form of medical issue, chances are that you’ve run into the mind-body connection.

It’s entirely possible to override the filtering the brain does. You can decide to pay attention to the signals from your finger more, and your brain will usually obey.

And it is possible that either your fingers are extra sensitive, or that the places you’re touching are atypically low in comparison to your fingers.

Generally, the two most sensitive spots on the body are the lips and the genitals. But there’s stuff that can interfere with that isn’t abnormal or a problem, but still shift the way the brain processes the signals coming in.

I’d try dimming lights, or even cutting them off, and very gently, with only enough pressure to make contact, move a fingertip, usually the index finger, across your lips. You can also try treating your finger like a lollipop, and wrap your lips around the tip to gently kiss. That gives greater area of contact, which will help if the issue is something like thicker skin on the lips.

And, at the risk of seeming weird, gently touching the glans penis (the head) or clitoris almost always works as the nerve density there is as high as it gets.

For me, my entire face feels the finger, but once I get past the chin or into the scalp, it shifts. Some people only have the lips, nose and sometimes eyes that are more sensitive than the fingers.