Dermatitis-sympathetic dysfunction in carpal tunnel syndrome. A case report.

A 52-year-old woman complained of numbness affecting the thumb, index, and middle fingers of both hands. The patient was managed with night splints with partial relief of symptoms. As a house cleaner, the patient was routinely exposed to water and detergents. About a year later, the patient developed contact dermatitis in the fingertips innervated by the median nerves. Electromyographic studies confirmed the presence of bilateral carpal tunnel syndrome. The temperature of all the fingertips was measured. The median innervated fingertips were warmer than those innervated by the ulnar nerves. The median sympathetic fibers may be compromized by compression in the carpal tunnel. This caused vasodilation, increased finger temperature, and lack of sweating in the median innervated fingers. Due to regular exposure to water and detergents, the susceptible dry fingertips developed contact dermatitis. The patient was managed conservatively, and the rash and numbness disappeared.