It all started last Thursday night -- when, as we previously reported, Neil's ex-girlfriend Alicia Jacobs filed a battery report against him, claiming the ex-rocker went ballistic on her and a friend while they were watching a show at the Las Vegas Hilton ... and bruised up her shoulder.
But Neil is adamant he never laid a finger on Alicia -- claiming SHE was the aggressor ... digging her nails into his skin and inflicting the bloody wounds in the picture.
We're told Neil -- who has already served 10 days in jail this year over a DUI case -- is considering pressing charges of his own.
