If the symptoms started off only today it could be just due to 'feeling too cold'.Did you have a long day?kept awake the whole night?There could be a gamut of reasons for your symptoms.
But if it persists I would advice you to meet the GP at once.How old are you?.These kind of symptoms should be correlated with age.Are you dibetic?Check for diabetes.Stop smoking if you are a smoker.
Do not ignore this symptom if it persists.Consult a neurophysician for an expert opinion.
Unilateral face numbness is nonspecific and can occur in many conditions.
Do you experience any other symptoms such as headache, dizziness, eye pain, or blurring of vision?
It would be helpful if you supplied more information about your symptoms.
If the symptoms are bothering you, you should consult a physician at the earliest possible time.