Hi, Welcome to HealthcareMagic Forum.
May be they are Actinic Purpura
, Kindly get him examined by a Dermatologist
so that he can examine him and rule out the exact cause. They are usually harmless and will subside on their own. He may not need medications if they are confirmed or the Doctor may prescribe him steriod
topical preparations. He should be avoiding going out in the sun between 10am and 4pm and use a Sunscreen lotion when ever he moves out.