I have a patch of skin on my thigh, above the knee, of approximately 6 X 3 inches that when I place either a cold or a hot item (a ice-cold glass or a hot coffee cup) there is no sensation for a few seconds, then with pressure I feel the cold or heat. And, occasionally, there is a prickling sensation in the area as though a feather is touching the leg area. Should I see my doctor regarding this.Thank you. Hugh