I’ve been incapacitated by pain for over 5 years. I sometimes use a TENS machine on my back and legs. I’ve used TENS for over 10 years. Yesterday I used my TENS on my right leg. I always follow the usage instructions and check settings, different for legs, neck, back etc and the timer. Today I woke up with square bruises, the shape of the adhesive pads from usage yesterday. My pain escalates over time so this year is worse than last, this week worse than last... but I have never reacted with such skin or muscle damage. Any ideas? Pain hypersensitivity to the extreme? Thanks in advance. Be well