You have given an excellent description of your son's rash on his eyelids. This is a common condition called 'blepharitis'. Try simple treatment first such as applying a warm [not hot] compress [the small round cotton- wool pads are best] twice daily to both his eyelids. This can be followed by gently washing his eyelids with a wet facecloth with a small amount of baby shampoo.read more about blepharitis on Google. If your son's eyelid rash does not clear he should be seen by his doctor as he may require an antibiotic eye ointment.
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