crab-yaws

from The Century Dictionary.

• The name applied to the tumors of frambœsia (yaws) when they appear on the soles of the feet and palms of the hands. In these places the thicker epidermis forms hard, callous lips, and the tumors are painful.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Med.) A disease in the West Indies. It is a kind of ulcer on the soles of the feet, with very hard edges. See yaws.