Have you ever noticed the small whitish arc at the base of your nails, just above the cuticle? It looks discreet, almost insignificant… but it may actually hold clues about your overall health. If it changes in shape, fades, or becomes unusually visible, this “lunula” might not just be a cosmetic detail.

What Exactly Is the Lunula?

The lunula—Latin for “little moon”—is the pale, half-moon-shaped area often seen at the base of the nail, most prominently on the thumbs. Far from being a decorative quirk, it represents the visible portion of the nail matrix, which is the growth zone of the nail.

This is where keratin, the protein that forms nails, is produced. Its lighter appearance comes from the absence of visible blood vessels in that area, in contrast to the pinkish tone of the rest of the nail.

Why Are Some Lunulae Visible While Others Are Not?

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