The invention provides methods, uses and compositions for the treatment of hidradenitis suppurativa. The tester can connect to a variety of types of trailers for the purpose of analyzing or monitoring the trailer’s circuit system. The attachment structure is formed integrally with at least one of the holding plate and the divisional segment. When the second etching step starts, a portion of the top surface of the bottom forming layer located in a region in which the second portion is to be formed is covered with the nonmagnetic layer or the initial groove mask.