The nitrogen-containing heterocyclic compound or the pharmaceutically acceptable salt thereof of the present invention is useful as a prophylactic and/or therapeutic agent for, for example, skin diseases and the like. The present invention provides a heterocyclic compound represented by the following formula (I) {wherein, X A represents CH and the like, R 1 represents cycloalkyl optionally having substituent(s) and the like, L represents a bond and the like, Y A represents -NH- and the like, R 2 represents a hydrogen atom and the like, R 3A represents the following formula (R 3A -1) (wherein, R 3 represents hydroxy and the like) and the like, and R 4A represents the following formula (R 4A -1) (wherein, R 4 and R 5 are the same or different and each represents a hydrogen atom and the like) and the like}, or a pharmaceutically acceptable salt thereof, which is useful as a prophylactic and/or therapeutic agent for skin diseases and the like, and the like.
