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Unexplained weight loss
and Bruising as your blood and other investigations are going on there has to be some reason for it.
Bruising may due to abnormality in platelets numbers or quality of platelets.( Thrombocytopenia
Some kind of coagulation or capillary problems.
Because of sufficient pressure for adequate time may not be applied from where blood was withdrawn some amount leaked in to sub cutaneous tissue.
Every thing depend on your test results.
I hope some treatable cause comes and you may recover