pustŭlo

āvi, ātum, 1, v. a. and n.

pustula

I. Act., to blister, to cause blisters or pustules; hence, mid., to blister, become blistered: ne usta pustulentur, Cael. Aur. Tard. 5, 1, 16.—
II. Neutr., to blister, break out into blisters, Tert. Hab. Mul. 6.
Lewis & Short
A Latin Dictionary, 1879
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