Ohtsuka, Mikio, et al. “Sarcoidal Granuloma Presenting on Tattoo: A Report of a Japanese Female Patient and a Review of Japanese Published Work”. Sarcoidosis, Vasculitis and Diffuse Lung Diseases, vol. 33, no. 1, Mar. 2016, pp. 83-89, https://mattioli1885journals.com/index.php/sarcoidosis/article/view/4246.