Following up this article Eastern Japanese starting to have bruises on their bodies..
Japanese famous people are blogging about their mysterious bruise as well.
Nakagawa Shoko, a Japanese idol blogged about her bruise around her thighs on 12/10 and 12/11/2011.
She says she doesn’t know why she had them,and they look huge.
Another person is Inoue Harumi, a Japanese actress.
She had her third son have bruise around his legs though nothing was wrong until afternoon of the day.
She took him to a hospital on 11/22/2011, but nothing was wrong according to the blood test.
She thinks she wrapped the diaper too tight.