Can you do a TCA peel to remove sunspots on shoulders?

TCA peels an be very effective treatments for reducing sun spots and hyperpigmentation.  Treatments are effective for patients with both light and darker skin color.  The peels should be done by a qualified and experiences provider.

TCA peels will remove the top layer of skin and exfoliate away brown spots. These peels can be used on areas other then the face. From experience the skin on your face peels very differently then skin on the neck and chest. The neck and chest tend to flake over a longer period of time. The key with peels is not to pick at an area that is peeling as that can actually lead to the deposition of brown pigment in an area. Peels that contain hydroquinone or kojic acid do a great job at reducing hyperpigmentation.
I do not market microneedling as a good way to treat hyperpigmentation. You do get light peeling with a  treatment and this can help minimize brown spots. I microneedle areas other then the face such as hands, neck and chest with great results. The benefits are typically improvement in skin tone and texture and reduction in fine lines. In rare circumstances I have seen hyperpigmentation in individuals that are microneedled.
Be careful with dermarollers as they can create shear forces that can tear and damage the skin.