Diagnostic pitfall of localized lentigo accompanied by post-inflammatory pigmentation on the palm with a several-month history

When dermatologists see acquired and wellcircumscribed pigmented macules on the palm, dorsal hand or forearm of the elderly, they tend to consider blue nevus, hematoma, nevus cell nevus and malignant melanoma as differential diagnoses [1]. We herein described the very rare case of localized lentigo accompanied by post-inflammatory pigmentation in a patient who has been treated for palmoplanter pustulosis for a long time. This eruption mimicked some kinds of lentiginous lesion and it was difficult to diagnose clinically.