The full text of this article hosted at iucr.org is unavailable due to technical difficulties. Image Correspondence Image Gallery: A case of porokeratosis ptychotropica Y. Wang Corresponding Author E-mail address: yangwang_dr@bjmu.edu.cn http://orcid.org/0000-0001-7805-2861 Department of Dermatology and Venerology, Peking University First Hospital, , Beijing, 100034 China Search for more papers by this author Funding sources: none. Conflicts of interest: none to declare.
