Red hands can be caused by contact dermatitis, hyperhidrosis, cold weather or candida. It could also be Raynaud's phenomenon which is a condition resulting in a series of discolorations of the fingers or the toes after exposure to changes in temperature. When a person experiences such symptoms it is advised that they see a doctor immediately.
1 Additional Answer
Red hands are normally caused by poor circulation of blood. You should try to massage the hand to improve the circulation. If it persists, you should see a doctor.