It may be a lack of trace elements and vitamins. I suggest you take zinc gluconate orally or take vitamin B at the same time. Be sure to drink more water. Eat more vegetables. Don't eat monosodium glutamate chicken essence, because it will increase the elimination of zinc. Because they may lead to an increase in zinc removal. Zinc deficiency is likely to lead to this disease. It could also be a virus infection.

Suggestion: In addition, it is suggested to treat the virus and try acyclovir ointment. It is also effective to rub the liquid in vitamin E on it.