u have herpes
labialis infection from the guy u kiss.
u need to consult dermatologist
as u need to take acyclovir
medicine as early as possible according to ur age and weight
avoid stress ,sun light,fast ,improper sleep ,smoke to avoid reoccurance as herpes has property to occur again once it subside.
apply plain antibiotic cream to prevent bacterial infection.
u can take analgesic
medicine for pain .