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The evidence in Oksana Grigorieva's case against her baby daddy Mel Gibson seems to be mounting.

In addition to damning tapes in which Grigorieva accuses him of hitting him while holding baby Lucia in her arms (a claim which Mel doesn't dispute) and a new picture of the baby with a blemish on her chin (which Oksana says is a result of the fight), Oksana was apparently diagnosed by a doctor with a concussion two days after the alleged incident took place, according to Radar.

“Oksana’s doctor diagnosed her with a concussion. It was a result of the punches to her face,” a source says. “She stayed in bed for weeks following the incident because she was suffering from bad headaches and was dizzy.”

Mel and Oksana are bitterly fighting over custody of their young daughter, Lucia, 7 months. Oksana is claiming verbal and physical abuse and wants his custodial rights stripped from him and Mel is having Oksana investigated for extortion in connection with the tapes.