If you ask your boyfriend, I think he'll confirm that this is the cause of the damp patch.
When the meeting resumed, several people walked across the damp patch on the carpet as if nothing had happened.
A cold east wind was blowing damp patches of fog in from the river.
You can look for damp patches though, particularly on outside walls.
He had taken the damp patches for blood until he saw their deep green color.
He glanced down and saw the damp patches on his coat, close about her.
He just sat there, staring at the damp, dark blue patch on his jeans.
There was nothing he could do about the damp patches under his arms.
His trousers had a damp patch on the right hip.
A damp patch has recently appeared on our extension wall.