Symptoms are variable among affected individuals, but it is widely accepted that the soles of the feet, palms, and the face are never affected by mitempfindung. There is no evidence of genetic influence on referred itch.
While symptoms in individuals with mitempfindung vary, it is well-established that the soles of the feet, palms, and face are never affected.  There is no scientific evidence to suggest a genetic component to referred itch.