Hot and cold sensations are not commonly examined on the face. However, it may be a useful thing to do. When a patient complains of pain or numbness in the face and the conventional pain-touch sensory examination as outlined above reveals no abnormalities, there may be some decreased awareness of temperature differences over the face. This can precede the loss of pain. Temperature sensation should not be examined as a routine measure (see the section on "Temperature" in Chapter 14).
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