The clip shows Kame forgetting his lyrics was back in the days of Seishun Amigo, their first performance on Music Station. I don't think it was as tragic as the time Yamapi dropped his mic while singing Daite Senorita (Kurosagi's theme), the singing went on even though the mike had already fallen. Lip synching smacked in the face, at least we know Kame was sining live when he forgot the lyrics. Anyway, I don't think Pi got too hung up over that incident, he came back the next week performing the full version of the song live without a single mistake.
I think Kame has pretty bad skin actually, in the close ups for Nobuta wo Produce and in the behind the scenes special, it was pretty obvious there were scars (acne?) on his face and his skin was not smooth despite the heavy makeup.