Evening primrose oil is the oil derived from the seeds of the evening primrose (Oenothera biennis) plant. Evening primrose oil has proven to be a valuable treatment choice for people suffering from skin conditions, such as eczema, psoriasis, and atopic dermatitis. You can also rub evening primrose oil into your hair or add it to your shampoo. The omega-6 present in evening primrose oil can help you to regulate your hormone levels and cure your hormonal acne issues. These also play a role in cell structure, improving nerve function and promoting skin elasticity.