A hand ( from Latin manus) is a prehensile, multi-fingered organ located at the end of the forearm or forelimb of primates such as humans, chimpanzees, monkeys, and lemurs. A few other vertebrates such as the koala (which has two opposable thumbs on each "hand" and fingerprints remarkably similar to human fingerprints) are often described as having "hands" instead of paws on their front limbs. The raccoon is usually described as having 'hands' though opposable thumbs are lacking.
High resolution thermography of normal hands, very little disapparences (palms are not the preferred target too as difficult to maintain out of thermal pollution).
Here, both hands are very different and a Doppler analysis is necessary to go further.
Very often, thermography helps to detect circulation's issues or anomaly. The upper image has a high potential of Raynaud's syndrom.