Edit/everyone seems so excited by barlowe being there, but I always thought he was fairly mainstream? Horror manga should have probably had the bigger image, and Norman Saunders should have been bigger than he already is too, but it was tough fitting things together!
That one is "The Bug Boy" by Hideshi Hino, who specializes in stories about little children undergoing horrific, disturbing mutations, diseases, curses and other fates worse than death.