Hello,
Plavix is used to prevent blood clots after a recent heart attack or stroke, and in people with certain disorders of the heart or blood vessels. You can go in the sun when on Plavix but make sure to apply a good sunscreen. Also when sitting on the swings, avoid sports or activities that could result in a bruising or bleeding injury.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your dermatologist. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
Yes, just use sunscreen of a high SPF (childrens kind is awesome, its usually SPF 45 or so)