From an unused root meaning to scratch; scurf (from itching) -- scab, scurvy.
Englishman's Concordance
1) itch, scab Part of Speech: noun masculine A Related Word by BDB/Strong’s Number: from an unused root meaning to scratch Same Word by TWOT Number: 376a
Leviticus 21:20 HEB:בְּעֵינ֑וֹ א֤וֹ גָרָב֙ א֣וֹ יַלֶּ֔פֶת NAS: in his eye or eczema or scabs KJV: in his eye, or be scurvy, or scabbed, INT: his eye or eczema or scabs
Leviticus 22:22 HEB:יַבֶּ֗לֶת א֤וֹ גָרָב֙ א֣וֹ יַלֶּ֔פֶת NAS: or eczema or KJV: or having a wen, or scurvy, or scabbed, INT: A running or eczema or scabs
Deuteronomy 28:27 HEB:(וּבַטְּחֹרִ֔ים ק) וּבַגָּרָ֖ב וּבֶחָ֑רֶס אֲשֶׁ֥ר NAS: and with tumors and with the scab and with the itch, KJV: and with the emerods, and with the scab, and with the itch, INT: of Egypt stronghold the scab the itch which