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).
Keratosis pilaris runs in families and is inherited from your parents. If one parent has the condition, there's a one in two chance that any children they have will also inherit it. Keratosis pilaris occurs when too much keratin builds up in the skin's hair follicles. Keratin is a protein found in the tough outer layer of skin, which causes the surface of the skin to thicken (hence the name keratosis). The excess keratin blocks the hair follicles with plugs of hard, rough skin.