The singer known as Seal has scarring on his face because he had a condition known as discoid lupus erythematosus when he was a child. Seal's condition has been in remission for many years. You can read more about discoid lupus erythematosus here: http://emedicine.medscape.com/article/1065529-overview.
Seal developed a scar on his face as a result of the medical condition called Discoid Lupus Erythematous which affects areas above the skin and neck. Seal is a British musician with a Nigerian and Brazilian background. Look here for more information: http://en.wikipedia.org/wiki/Seal_(musician)#Early_life.