"Love & Hip Hop: Hollywood" star Yung Berg allegedly did a real number on his girlfriend -- leaving her with nasty injuries over much of her body when they had a hotel room brawl in NYC.
Masika Tucker told police ... "He hit me and dragged me by my hair. He pinned me to the wall and grabbed me by my throat" -- this according to the criminal complaint obtained by TMZ.
In the docs, Tucker says she suffered a laceration to her right forearm, a laceration above her left eyebrow, bruising to the left side of her neck, and a laceration to her chest.
In all, Berg was hit with four charges -- three assaults and one harassment -- but managed to avoid the "obstruction of breathing" misdemeanor ... which he was initially booked for when he got arrested.