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Michael Lohan, who was present at the Beverly Hills Courthouse this morning for Lindsay's hearing, says he was attacked last night outside of his Santa Monica apartment ... and he's got the wounds to prove it.

X17online grabbed these shots of Lohan just before the hearing began. You can clearly see the wounds on his hand and neck that were caused by "a blade of some kind," says a source.

When Lohan was asked for details on the incident, Lindsay's dad did keep his promise about not speaking to the media and declined comment.

However, according to a source, Michael had gone out for a smoke last night and was attacked from behind. He refused to be transported to the hospital, and instead, chose to be treated at his apartment.

Police are still looking for the alleged attacker.