Voyager wrote:What happened to his face - did he get hit with a grenade?

"But Seal's scars are not the result of violence. Jet reported that Seal's facial scars are the result of the disease lupus. At age 23, Seal developed discoid lupus erythematosus (DLE), a rare form of the disease causing scars. Source: Celebrities Who Have Overcome Obstacles, Jet, June 10, 1996, available at books.google.com.
According to The Lupus Book, only ten percent of lupus patients have DLE. Thick, scaly lesions appear on these patients' skin, especially skin that is exposed to sunlight. If untreated, the lesions can turn cancerous. Source: Daniel J. Wallace, The Lupus Book, 4th ed., Oxford University Press, pages 70-71."