Coexistent Lichen Amyloidosis and Acquired Reactive Perforating Collagenosis in Type 2 Diabetes Mellitus and Post-Thyroidectomy Hypothyroidism Due to Papillary Thyroid Carcinoma: A Rare Case.

An abundance of endocrine receptors is expressed on the skin and becomes the target of many hormones. This was associated with various skin diseases that might occur in some endocrine diseases eg, lichen amyloidosis (LA) and acquired reactive perforating collagenosis (ARPC). Here, we report a coexistent LA and ARPC in a 55-year-old woman, characterized with multiple pruritic hyperkeratotic papules and plaques on both arms accompanied by pruritic hyperkeratotic papules and nodules on both legs. She had a history of type 2 diabetes mellitus (DM) and post-thyroidectomy hypothyroidism due to papillary thyroid carcinoma. Histopathological examination revealed amyloid deposition in the papillary dermis corresponding with LA and cup-shaped epidermal depression filled with collagen corresponding with ARPC. The hyperkeratotic papules and nodules flattened in one month after application of 0.05% clobetasol propionate ointment with occlusion on both arms and 0.05% retinoic acid gel on both legs. Hyperkeratotic papules, nodules, and plaques in a patient with a history of endocrine diseases, such as type 2 DM and thyroid disorders should undergo histopathological examination to confirm the diagnosis of skin diseases eg, LA or ARPC.