Just as the under-eye area is unique from the rest of the face, the arms are unique from other areas of the body. Arm skin has very few sebaceous glands. This means it’s highly susceptible to dehydration. And because of its relatively low oil content, arm skin has a tendency to develop a loose or crepey appearance—regardless of one’s age or size. Furthermore, the arms’ delicate composition makes it one of the first areas of the body to show signs of aging.