case_images: PMC7739077_01
case_images: (a) Right palm with numerous faint tan-brown hyperpigmented macules ranging from 2 to 7 mm on central palm and scattered faint tan-brown hyperpigmented macules between finger spaces bilaterally. (b) Evidence of improvement in hyperpigmentation on palm after vitamin B12 supplementation. (c) Palate and tongue with faint tan-brown hyperpigmented macules. (d) Evidence of improvement in hyperpigmentation on tongue and palate 6 months later.
case_images: 10.1177_2050313X20979207-fig1.jpg
case_images: PMC7739077_01_10.1177_2050313X20979207-fig1.jpg
case_images: fig1-2050313X20979207
case_images: Dermatology for evaluation of asymptomatic hyperpigmentation of the palms, soles, hard palate, and tongue for 6 months (Figure 1(a) and (c)). Dermoscopy was not performed on the mucocutaneous lesions. At that time, her B12 level increased to 844 pg/mL, and there was significant improvement in hyperpigmentation (Figure 1(b) and (d)).