Your facial numbness in migraine is actually a sensory aura.
Migraine symptoms are not always confined to the head. Sometimes there are other parts of the body that are affected by migraines. As changes occur in the brain, different sensations may be felt throughout the body.
It’s not uncommon to feel numbness or tingling in a small or large area of the body. These symptoms are sometimes associated with sensory aura.
Numbness symptoms may include
Numbness in the lips, tongue or legs
Numbness on one side of the body
These sensations of numbness, sometimes called sensory aura, can occur before, during or after the migraine pain begins. Most often the sensations occur on the same side of the body as the pain in the head.
About 15 percent of migraine sufferers experienced numbness in the face and 13 percent felt their leg or arm went numb, in a study of 740 migraine sufferers.