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.
The other good news is that it takes this reading at the time when you take 'first pressure' on the button to take your picture. Dark clothing and a dark background would tend to cause over exposure of the face and hands of the singer. To make matters worse the lights are constantly changing as well.