Laser Genesis is typically spaced 2 weeks apart. As an absolute MINIMUM I would do at least 1 week between treatments. Skincare is a marathon not a sprint- no need to rush!
It depends what chemo treatments you are having for you ovarian cancer, but Laser Genesis treatments are usually very safe as they effect only the dermis and not the epidermis.
Yes, I often use this for mild scarring especially pigmented scarring. Over time it can induce collagen production. It is a modest method to treat mild and early acne scars, with little risk, and no downtime. The downside? 8-10 seasons 2 weeks apart are needed. More on acne scars in the link...