Thanks for your query.
The pain described by you seems to me muscle pain
that may be related to your work pattern. Keep yourself if possible from work for a week or two. I dont know whether any colour changes occur there or not. But in all probability it seems to me muscle pain. Though you must have an x-ray to exclude fracture
. Give there hot compression, take analgesics and muscle relaxant
like thiocholchicoside 8 mg thrice daily and give complete rest to your hand for 10 days and look for improvement. If no improvement is there then do a nerve
conduction velocity testing for that upper limb to exclude neurological deficit. I think by all these you will be able to come to a diagnosis.