The pyridone 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.According to the present invention, a pyridone compound represented by the following formula (I) [wherein, R1 represents cycloalkyl optionally having substituent(s) and the like, R2 represents a hydrogen atom and the like, R3 represents hydroxy and the like, and R4A represents the following formula (R4A-1) (wherein, R4 and R5 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 are provided.
