“…We identified 48 clinical trials investigating systemic tetracycline treatment efficacy in inflammatory acne, 29 trials investigating minocycline systemic treatment efficacy, 28,37,39,45,46,54, 10 trials investigating doxycycline systemic treatment efficacy 8,9,20,62,68,69,[81][82][83][84] and seven trials investigating lymecycline systemic treatment efficacy, 77,80,[85][86][87][88][89] 57 of which were included. 8,9,12,14,16,17,[19][20][21]23,[25][26][27][28][29][30][31][32][33][34][35][36][37][38]41,42,…”