Hello and Welcome to HCM,
Thanks for writing to us.
Unexplained appearance of bruises without any history of injury
can happen due to platelet dysfunction
or recent viral illness, drug intake or a bleeding disorder
. Detailed examination and blood investigations are entailed to detect the cause. So I suggest you to consult your doctor soon for thorough evaluation.
Hope this helps you.
Wishing you good health...
Dr Saurabh Gupta.