Dear friend, welcome to HCM!
You may be right in saying that it is a blood clot with a bruise
With your easy bruisability, you should get evaluated for any bleeding or clotting disorder
A CBC, BT, PT, LFTs, PT, PTTK are the initial tests done for these after a physical examination.
bruises may occur without bleeding disorders due to fragile skin, blunt trauma
, use of drugs like aspirin
Please consult your doctor about this.
Take care and please keep me informed of your progress.
I hope to have answered your query satisfactorily.