PYRIDONE COMPOUND

摘要

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, R 1 represents cycloalkyl optionally having substituent(s) and the like, R 2 represents a hydrogen atom and the like, R 3 represents hydroxy 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 are provided.