Sources close to Tori Brixx tell TMZ ... she was pistol whipped by the robbers who broke into her home demanding cash and jewelry, suffering a deep laceration on her cheek, along with bruising and swelling around her eye. We're told Tori's sister was present, as well, but did not sustain any physical injuries.

Tori was taken to the hospital and required several stitches before being discharged Friday morning.

We broke the story ... the rapper was allegedly attacked and robbed at gunpoint by several men and hospitalized. The LAPD confirms they're investigating a home invasion robbery, but there are no suspects or arrests at this time.