case_images: PMC10257433_01
case_images: Clinical photograph showing gray pigmentation on the lower labial mucosa with ulceration.
case_images: IMCRJ-16-345-g0001.jpg
case_images: PMC10257433_01_IMCRJ-16-345-g0001.jpg
case_images: f0001
case_images: The lower left alveolar ridge and labial mucosa had an asymptomatic dark grey pigmentation of 2-3 cm associated with mild erythema and ulceration (Figure 1) without any changes in its size or shape.
case_images: Hematoxylin and Eosin Stain, magnification X200, showing inflamed and ulcerated mucosa with focal thickening of the basement membrane, spongiotic pustules and intraepithelial microabscesses.
case_images: IMCRJ-16-345-g0002.jpg
case_images: PMC10257433_01_IMCRJ-16-345-g0002.jpg
case_images: f0002
case_images: Epithelium shows focal spongiotic pustules and intraepithelial micro abscesses (Figure 2).
case_images: Hematoxylin and Eosin Stain, magnification X100 showing chronic inflammatory cell infiltrate present at the juxta epithelial and deeper connective tissue.
case_images: IMCRJ-16-345-g0003.jpg
case_images: PMC10257433_01_IMCRJ-16-345-g0003.jpg
case_images: f0003
case_images: Peri and para-vascular inflammatory cells are also noted within the deeper connective tissue (Figure 3).
case_images: Clinical photograph showing complete resolution of symptoms and pigmentation after discontinuing the dye.
case_images: IMCRJ-16-345-g0004.jpg
case_images: PMC10257433_01_IMCRJ-16-345-g0004.jpg
case_images: f0004
case_images: Although the patient was scheduled for a follow up after one month, the patient attended only after 2 years revealing complete resolution of symptoms and most of the pigmentation (Figure 4).