Cold sores after oral?

i started having oral sex with my boyfriend. after a while i noticed i get some cold sore looking things a little after. what is wrong!! they look really nasty too!!

help

cold sores and fever blisters are type 1 herpes simplex. 80% of sexually active adults have (oral herpes) type 1; this type of herpes can be present anywhere on the body, including the genitals. 60% of sexually active adults have type 2 herpes (genital herpes) which occurs only on the genitals (& transmits only to the genitals) . type 2 will not spread to the mouth. you probably contracted type 1. be careful if you end up having intercourse with your boyfriend as you may contract type 1 in the genital region. you are most contagious when you have a sore, especially if it is oozing or crusty, but you are always contagious. there is no cure, but best to go to the doctor and make sure you don't have a systemic infection. encephalitis or inflammation of the brain is a very serious side effect that could come with herpes. Source(s): http://en.wikipedia.org/wiki/herpes_simp...

He probably has herpes, and gave it to you.
Herpes
Cold sores are a form of herpes simplex. Sounds like he just gave you herpes.

"Herpes simplex is commonly referred to as cold sores or fever blisters. It is a viral infection of the skin that may occur once or return again and again.
Herpes simplex is transmitted by sexual contact, kissing, or other close contact. Family members should not share towels or linen with someone who has an outbreak of herpes on the genitals or cold sores. Herpes can spread from person to person even when an "infected individual has no outbreak or symptoms.
http://www.skinsite.com/info_herpes_simp...
I agree, sounds like herpes. Fortunately it's treatable. Go see the doctor.