My husband found blood on his chest as he had just got out of the shower, there were no cuts, then when I looked at my white t shirt there was a blood stain on the same spot, no injury inflicted on either of us.

Strange.
Did he hug you when he got out of shower?
Did he wear your shirt.
Could he have been bleeding from nose and dripped on chest, hugged you?
Very Strange, only thing stranger is my Questions.
Good Luck, Take Care

The same thing happened to me and my sister but at different times. It was during the same year but in different months. We both found dried blood on the right breast of our bras but there were no cuts we could find and it wasn't anywhere else.