i am a carpenter, used to work on my knees alot a, but haven't done in the past few years. I have puple coloured knees which sometimes is sore to touch, but not often. I would like to know if this has anything to do with my work, or could it be a form of arthritis, as also my pinky finger the joint it quiet stiff, and physically open my pinky finger in the mornings when i wake as it will not open by itself?? i am 27yrs of age. thanks.