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What would cause horizontal ridges on fingernails?
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Dr. Michael Fisher
Dermatology
In brief: Beau's lines
Beau's lines, which are grooves that run horizontally across the nail plate.
They usually develop when nail plate growth, which begins in the nail matrix (located under the cuticle), is temporarily disrupted. This can occur with direct injury to the nail matrix; an inflammatory condition such as psoriasis; infection around the nail plate; repetitive picking at the nails or cuticles; or sickness.

In brief: Beau's lines
Beau's lines, which are grooves that run horizontally across the nail plate.
They usually develop when nail plate growth, which begins in the nail matrix (located under the cuticle), is temporarily disrupted. This can occur with direct injury to the nail matrix; an inflammatory condition such as psoriasis; infection around the nail plate; repetitive picking at the nails or cuticles; or sickness.
Dr. Michael Fisher
Dr. Michael Fisher
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