Multiple causes: It could be due to a contact allergy such as allergy to a toothpaste, a vitamin deficiency, constant licking or other cause. Try changing toothpaste. A dermatologist could help resolve it quickly.
Answered 1/22/2016
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8 doctors weighed in across 2 answers
A doctor has provided 1 answer
A doctor has provided 1 answer
6 doctors weighed in across 2 answers
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