John Stamos says he was caught off guard by the controversy his bald cap tribute to Dave Coulier has caused on social media.

He wears a bald cap in the series with prosthetics and makeup ... the brothers claimed that the wig incident led Erik to tell Lyle that he had been sexually abused by their dad from the age ...

John Stamos showed up in a bald cap to help shave his 'Full House' co-star's head, but the show of solidarity didn't sit ...