For the past several months, my middle finger has been "locking" at night. Its getting increasingly more painful, but, when I "use" my hand during the day, the "locking" is less. I was wondering if there are excercises to lessen this disease? Two doctors have told me that I have DC ...and the "lump" or bump on my palm is obvious. The palm is also itchy and uncomfortable. Would appreciate any information. BTW have had malignant melanoma on the thumb of this hand - in 2000 and a reoccurance in 2001. Additionally, I have experienced the removal of a significant number of lymph nodes under this arm, 9 years ago due to breast cancer. Also wondering if there are any links to these situations? Thanks.