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Dear this spot which you have noticed in the morning could be a bruise/ ecchymoses. It usually develops unnoticebly to some persons because of day to day hectic activity. Usually it subsides spontaneously in 4 -5 days.
But still to be sure enough, This can be examined by the physician. He can investigate you accordingly for Platelet count
, Bleeding time
, Clotting time and Prothrombin Time
to ruleout any possibility of bleeding disordor, which are not very common.
Hope your query is answered with your satisfaction