The cause of palmar pachyderm is considered to be related to physical labor, poor peripheral blood circulation, traumatic stimulation and other factors. 1. Physical labor: most of the causes of palmar pachyderm may be related to sports factors, which can be relieved after elevating the affected limb or after resting, and most of them are physiological phenomena. 2. Poor peripheral blood circulation: the cause of palmar pachymetry in some patients may be related to poor peripheral blood circulation, especially when the veins are dilated, blood stasis, slow blood flow. 3. Traumatic stimulation: some patients will be due to local trauma, resulting in bleeding of subcutaneous blood vessels, which in turn produces the phenomenon of palmar pachymetry. Of course, there are other reasons for the purple color of the palms, if you can not determine the cause, you can go to the hospital, cooperate with the doctor to improve the examination, and then do the treatment.