In addition to studies on photosynthetic bacteria performed thus far, we utilized the established strengths of photosynthetic bacteria i.e., their production of SOD and catalase and their rich nutrients, to explore new functions of photosynthetic bacteria in relieving skin ailments such as atopic dermatitis by supplying nutrients to the skin and removing harmful active oxygen from the body with the view of preparing a new horizon for photosynthetic bacteria. Here, CAT is linked to atopic eczema.