Provided is a therapeutic agent for dermatitis, comprising a compound of formula [I] or a pharmacologically acceptable salt thereof as the active ingredient,wherein R1and R2represent a lower alkoxy group； ＝ X － represents a group of the formulaor a group of formula ＝ N －； Ring A represents a saturated or unsaturated, nitrogen－ containing dicyclic heterocycle group having 1 to 4 substituents selected from a hydroxy, oxo, lower alkoxy, di(lower alkyl)－aminophenyl, piperidino－lower alkoxy, morpholino－lower alkoxy, lower cycloalkylamino－lower alkylamino, pyridyl and morpholino group；represents a single or double bond.本發明提供一種外用皮膚炎治療劑，其係以下式[I]所示之化合物或其藥理上可容許之鹽做為有效成分：(式中，R1及R2表示低級烷氧基；＝X－表示下式所示之基：或以式：＝N－所示之基；環A表示具有從羥基、側氧基(oxo)、低級烷氧基、二低級烷基胺基苯基、N－哌啶基(piperidino)低級烷氧基、N－嗎啉基(morpholino)低級烷氧基、低級環烷基胺基低級烷基胺基、吡啶基及N－嗎啉基中選出之1至4個取代基之飽和或不飽和二環式含氮雜環基；表示單鍵或雙鍵)。
