PURPOSE: A composition for treating dermatitis using a plant extract is provided to suppress degranulation and 5alpha-reductase and to ensure antibacterial activity against bacteria causing athletes foot and acne.CONSTITUTION: A composition for treating dermatitis contains a Duchesnea chrysantha plant extract, a red ginseng extract, or a Zanthoxylum planispinum leaf extract as an active ingredient. The dermatitis is acne and athletes foot. The composition is a cosmetic, cleansing, pharmaceutical, or food composition. An anti-histaminic composition contains the Duchesnea chrysantha plant extract, a red ginseng extract, or a Zanthoxylum planispinum leaf extract as an active ingredient.COPYRIGHT KIPO 2013본 발명은 피부 질환 개선제 조성물에 관한 것으로, 구체적으로 탈과립 억제 활성, 5α-리덕타제 억제 활성, 무좀과 여드름 원인균에 대한 항균 활성을 가지는 뱀딸기 추출물, 홍삼 추출물 및/또는 개산초나무 잎 추출물을 이용한 피부 질환 개선제 조성물에 관한 것이다.