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Hello, I am not sure if this is a PWS. But, I would not worry about passing it on to your children. It would be a very good idea to see a specialists. A Derm. to determine what type of birthmark you have. Dr. Mihm in Boston also treats birthmarks that are non-vascular...like Mongolin spots/hairy nevus. Something might be available to help you and your questions about passing it to your own children could be answered better by a specialist. Dr. Mihm's information can be found under the physician's list. Also, use this resource to find a specialist in your area.