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).
Some foods that are rich in Omega-3 are salmon, scallops, sardines, soybeans, walnuts, tofu and flax seeds. A Keratosis pilaris diet should also consist of raw foods, especially vegetables, so that the nutrients can be quickly absorbed by the body. In fact, one should opt to switch to a vegan diet even for just half a year to be able to observe noticeable positive results. A vegan diet excludes meat, eggs and dairy products.