Thanks for your query
Seems like you are either developing recurrent bruises or such purplish skin lesions can be part of a vasculitic skin disease.
I think you need proper assessment in the form of various blood tests.
In such cases, sometimes even a skin biopsy
has to be done for confirmation of the diagnosis.
I hope you are not presently on any drugs for any other skin condition and certain drugs can lead to development of such lesions.
Avoid taking any painkillers or antibiotics of your own.
So I would advise you to visit a dermatologist
for proper assessment and treatment.
Hope it helps
Best wishes for a speedy recovery
Dr Geetika Paul