What are these spots on my skin?

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i had open heart surgery as a kid, these spots appeared a few months ago it started with just one and now there are many… any ideas on what it could be, i have searched and searched and have not find anything too similar they do not itch or hurt

It may be Pityriasis rosea. Its a puzzling rash and sometimes it itches but sometimes it doesnt. Thought to be caused by a virus and doesnt usually need any treatment if it doesnt itch. Often lasts about 3-4 months then clears. If you are worried then do go to your doctor,especially if you feel unwell.