In the case of Lyme, active infection past the 4 week mark is expected to show IgG antibodies. After treatment and resolution of the illness, tests can still show IgG antibodies. And so, IgG can represent either current or past infection.
What Really Happened to Seal's Countenance. 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.
Per Wikipedia: Although there have long been rumours as to the cause of the scars on his face, they are not the result of a tribal sacrificial rite. Sealâs appearance is the classic example of the condition discoid lupus erythematosus (DLE). Seal contracted the disease at 23, a condition where the immune cells attack various body tissues; DLE usually affects young people.