case_images: PMC5861519_01
case_images: Dorsum of the tongue revealing violaceous to dark grey discoloration and blunted papillae in the centre with few tiny bright red erosions (black arrow) and interspersed white reticular lesions.
case_images: f1000research-7-15654-g0000.jpg
case_images: PMC5861519_01_f1000research-7-15654-g0000.jpg
case_images: f1
case_images: The dorsum of the tongue revealed violaceous to dark grey discoloration extending onto the ventral surface, interspersed with white reticular lesions and focal tiny bright red erosions ( Figure 1).
case_images: Mild desquamative gingivitis with gingival hyperpigmentation.
case_images: f1000research-7-15654-g0001.jpg
case_images: PMC5861519_01_f1000research-7-15654-g0001.jpg
case_images: f2
case_images: Although mild desquamative gingivitis with gingival hyperpigmentation were appreciable, the lips were spared with no visible freckling ( Figure 2).
case_images: Longitudinal melanonychia of multiple (
  a) fingers of the left hand, and (
  b) toes of the right foot. Pigmentation of the proximal and lateral nail folds is conspicuous.
case_images: f1000research-7-15654-g0002.jpg
case_images: PMC5861519_01_f1000research-7-15654-g0002.jpg
case_images: f3
case_images: Examination of nails revealed longitudinal melanonychia of multiple fingers and toe nails ( Figure 3).