During a heavy concert schedule in Russia in 1912, he interrupted his schedule because of stiffness in his hands. This may have been due to overuse, although carpal tunnel syndrome or simply swelling and puffiness of the hands associated with acromegaly may have been the cause. In 1942, Rachmaninov made a final revision of his troublesome Fourth Concerto but composed no more new music. A rapidly progressing melanoma forced him to break off his 1942–1943 concert tour after a recital in Knoxville, Tennessee. A little over five weeks later he died in the house he had bought the year before on Elm Drive in Beverly Hills. Melanoma is associated with acromegaly and may have been a final clue to Rachmaninov's diagnosis.