acrohyperkeratosis

ac·ro·hy·per·ker·a·to·sis

(ak'rō-hī'pĕr'ker-ă-tō'sis),
Thickening of the horny layer of the skin, usually nodular, of the dorsum of the fingers and toes, and occasionally on the rim of the ear and the tip of the nose.
[acro- + hyperkeratosis]
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