✔ 最佳答案
you have to rule out herpes infection.
it require treatment and cream.
go and see your family doctor.
my family doctor in Tai Wai (Dr. Ho) is quite good on this and he can tell you what happen (because i have seen him 1 months ago for the same problem),
he is very nice and may be you can see him if he can help you.
His clinic Tel no 2634 5530
Hope he can help you.