A finger prick that is invisible but painful to the touch may be caused by a small foreign body that has penetrated deeper, or it may be caused by a microscopic, very small burr that remains in it.
If the finger prick is very deep and reaches the depth of the muscle layer, in this case, even if the prick is not retained in the muscle layer tissue, there will be local bleeding, edema, congestion and other conditions due to the trauma, so touching the traumatized area will have pain or pain aggravation.
If you touch the puncture site, when touching the skin surface stroking or slight pressure, there is obvious pinching, stinging sensation, which indicates that there is a micro-small burr retained in the tissue, due to its very small, so it is not easy to be observed.
This can go to the hospital’s general surgery clinic for treatment, is not complicated, can let the doctor with a micro-amplified role of medical instruments, will be observed to remove the small burr, and then local sterilization.
It is advisable to seek medical attention to avoid infection and to administer tetanus antitoxin to prevent tetanus.