What does it mean if I have hand redness?

Could mean 100s. Of different things. Question must be considered in context of complete history and phys exam.
Raynaud's? This could be a condition called raynaud's. The arteries in the hands clamped down when exposed to cold. The hands can turn white then red or blue. This typically is not a serious condition and can best be treated with avoidance of cold exposure to the hands.