Gave unprotected oral sex 2guy with hiv. No ejaculate, but mbe precum. Small cluster cankersoars upper lip next day. Got worse this week. Hiv?

Don't know. No one can be sure based on just that symptom. You should get an HIV test and use protection from now on.
See Dr 4 your mouth. Also need to get HIV tested and please be more careful in future. Sex is fun for a few minutes, HIV is for life!