Can I use BioCorneum under my silicone sheeting?

yes u can use biocornium under the silicone scar sheet.  If you had to choose between the two pick whichever one you will be consistent with

Yes, you can use BioCorneum under your silicone sheeting!
Personally, I recommend both after the incision is healed to promote by hydration and "splinting" of the incision, which reduces tension and improves scarring.
BioCorneum is a silicone gel that provides a protective layer and promotes scar healing by hydrating and improving the appearance of scars. It works best when allowed to dry and form a thin, flexible layer over the scar.
Silicone sheeting or taping also works by applying gentle pressure to the scar, promoting hydration, and creating a barrier to protect the scar from environmental factors.
Since BioCorneum is a gel, it dries quickly and forms a thin film, which could potentially enhance the effectiveness of the silicone sheets by providing additional hydration and creating an even surface for the sheets to adhere to. Using both products together can provide the benefits of both methods.
Krishna Vyas, MD, PhD, MHSHarvard and Mayo Clinic Trained Aesthetic and Plastic SurgeonNew York, New York

If you already have the biocorneum, use it underneath the sheets. I would continue to suggest the use of Plato's scar serum for new and old surgical scars on the breasts. Best, Dr. KaramanoukianLos Angeles