By Nyssa Beech My little brother sniffled and looked sad. His hands were cracked, painfully dry, bleeding. Mom was carefully smearing a thick, white cream over the uneven landscape, moving from his hands to his legs, to the crevices behind his knees. I watched somberly, scratching my inner elbow. Eczema doesn’t necessarily sound like the worst problem in the world: it’s most common in infants and young children, and it often disappears with age. It’s just a rash on the skin. Right? When I was in elementary school, I began developing eczema, too. As little brother grew out of his, I grew into mine. It was just on my arms at first, in the cracks where they bent. Angry red splotches that were impossible for…