A 58‐year‐old man with porokeratosis ptychotropica: A successful treatment with alone cryotherapy and literature review. Issue 1 (7th January 2021) - Ghahartars, Mehdi; Zahraei, Seyed Ali Hossein; Sari Aslani, Fatemeh; Hadibarhaghtalab, Maryam; Parvizi, Mohammad Mahdi