Liu, Ziqi, Qiaoan Zhang, Lianjun Chen, and Qiong Huang. “An Ulcerated Nodule on the Toe in an Elderly Patient: A Quiz”. Acta Dermato-Venereologica 105 (April 16, 2025): adv43431. Accessed July 20, 2026. https://medicaljournalssweden.se/actadv/article/view/43431.