As TMZ first reported, Margera claims he woke up in the middle of the night to find a woman trying to kiss him, and when he went to call police ... she laid on the floor and started masturbating.
Bam claimed a cold sore sprouted on his mouth following the incident -- and believes it's the result of direct contact with the woman (ew!!!) or from the stress of the whole thing. But last night in Hollywood, Bam recounted the ordeal for us and gave us the good news ... his cold sore has cleared up.
Bam says he's not interested in pressing charges and just wants to see the woman get help.
Starting with a shot of penicillin, perhaps?