Welcome to HCM
We understand your concerns
The straight line bruise
, have you examined it? It is supposed to be sour and burning because it is briuse and it is fresh. Don't worry.
In my opinion, it might have been caused by your toe or finger nails due to scratching while you were soundly asleep. Hppens all the time with all the people. Roughtnsess and dryness of skin induces scratching and people do scratch while they are asleep. Check your nails and clip it.
Hope you are satisfied with my answer.