Contact dermatitis is a common skin disease in Morocco, which represents about 20% of dermal diseases treated in Moroccan hospitals. In this study, our aim was to investigate the anti-eczema activity of essential oils of three Moroccan aromatic and medicinal plants: Thymus vulgaris, Mentha spicata and Citrus limonum vis-a-vis the contact dermatitis which is a manifestation allergic to the skin, in response to contact with a foreign substance called allergen. It is characterized by irregular lesions sometimes microvesiculeuses or dry. These lesions are characterized functionally by intense itching and scratching force, they may be infected. The three oils studied, have shown efficacy in the treatment of contact dermatitis.