Most oxygen enters the starfish via diffusion into the tube feet (with the water vascular system), or the papulae (small sacs covering the upper body surface). Reproduce alone, or with a mate: Sea stars are capable of both sexual and asexual reproduction. Individual sea stars are male or female.
Specifically for keratosis pilaris, I would make extra certain that you are not eating foods with new-fangled vegetable oils such as corn, sunflower, vegetable a.k.a. soybean, grape seed, cottonseed AND canola oils. These non-traditional vegetable oils are packed with super unstable PUFAs (poly-unsaturated fatty acids).
Causes of Keratosis. Some types of keratosis are caused by sun exposure. Genetics may also play a role since there is usually a family history of keratosis. To research the causes of Keratosis, consider researching the causes of these these diseases that may be similar, or associated with Keratosis: Seborrhoeic keratosis.