scurf
皽 centers on flaky, peeling skin or scurf. It describes the dry, scaly material that sheds from the skin's surface.
皽 combines 皮 (skin) with 亶, which likely contributes the sound. The character is associated with skin conditions, specifically scurf or peeling skin.
The right side 皮 means skin, and the left side 亶 looks like a container with something flaking off. Picture skin peeling away in small dry flakes.
For テン, imagine ten layers of dry skin peeling off: ten -> テン, and each layer is a flake of scurf.