The baboon syndrome is a form of systemic contact dermatitis with skin eruptions in the area of the buttocks and major flexures. Inhalation of mercury vapor causes this rare but distinctive eruption. Broken thermometers are the usual sources of exposure. We hereby present a 14-year-old boy diagnosed with baboon syndrome coexistence with vitiligo, due to broken thermometers. In our case, it was interesting that erythematous eruptions were more evident on the vitiliginous side of the trunk. To our knowledge, there have been no reports in the literature of baboon syndrome and vitiligo coexistence.