White pigs tend to sunburn more than the blacks do.
I have both and AbbyD is always sunburned and peeling. Also mange will cause them to peel and even after treatment as the dead mites work out from under the skin. They should have a treatment of ivomec or dectomax about every 4 months for this. For urinating in the house, you have to get totally rid of the ordor or they will keep going back to it. Try Ordor Ban or even white vinegar poured directly on the spots and let it air dry after the treatment.