Vitiligo is a chronic, (long-standing) supposedly “autoimmune" disorder that removes pigment from the skin to leave random whitish patches as seen on the lips of the young woman in Figure 1.
This condition is generally thought to be caused by auto-immunity, when the body's immune system attacks pigment-containing cells that cause patchy, frequently bilaterally located, lightened skin patches. This occurs when melanocytes – the skin cells that make pigment – are damaged or destroyed, causing the skin to turn a milky-white colour.
My theory is quite different. For some reason, groups of cell receptors responsible for maintaining skin pigmentation lose their functionality (many possible causes) and lose contact with the brain. Also, skin pigment loss in these patients is frequently bilateral, which could be due to a "crossover" effect from one side of the brain to the other side.
Skin de-pigmentation has been generally considered to be irreversible, but as shown in the photographs below, wheatgrass extract has significantly restored some of these discoloured areas, often completely, by lightly applying wheatgrass extract over the affected area(s) once or twice a week, and persevering for at least two or three months.
The damage is usually considered irreversible, but wheatgrass extract can help restore these depigmented areas to their normal colour, apparently by re-connecting damaged cell receptors in the affected area(s), as shown in Figures 2, 3 and 4, to normal. The photographs above and below are from the same patient.