Reversible acral and mucosal hyperpigmentation in a patient with B12 deficiency secondary to polyglandular autoimmune syndrome type II

Ishan Asokan, Rachel Wheatley, Jenna Lullo, Meiling Yuen, Jan Smogorzewski
SAGE Open Medical Case Reports 2020, 8: 2050313X20979207
33403114
Reversible cutaneous hyperpigmentation often occurs in the setting of nutritional deficiencies and protein energy malnourishment, with atypical presentations arising from autoimmune disease. Here, we present a 52-year-old female with hypertension, type 1 diabetes, and Hashimoto's thyroiditis, under the diagnosis of polyglandular autoimmune syndrome type II, referred for evaluation of asymptomatic hyperpigmentation of the palms, soles, hard palate, and tongue for 6 months. The patient underwent a significant work-up, including esophagogastroduodenoscopy, which revealed hypertrophic gastropathy as well as evidence of acquired B12 deficiency secondary to pernicious anemia. The patient was initiated on B12 supplementation, with eventual resolution of mucocutaneous findings.

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