Since when is this happening? Are you on any medications? Were any investigations done? Any significant past medical or surgical illness?
Do you smoke? Take alcohol?
Following are the causes to be looked for the hot and swollen hands:
1) Raynaud's disease and Raynaud's phenomenon
2) Reflex sympathetic dystrophy
5) Fibromuscular dysplasia
6) Hypersensitivity angitis
8) Lymphatic outflow obstruction
9) Burger's disease
Various investigations like Colored doppler studies, blood work for autoimmune disorders, thyroid function tests may be needed to ascertain the causative. An internist, clinical Immunologist or a rheumatologist may be the specialist to find the pathological mechanism.
Please feel free for your follow up questions.