a boil
Leviticus 13:18-20
18
The flesh also, in which, even in the skin thereof, was a boil, and is healed,
19
And in the place of the boil there be a white rising, or a bright spot, white, and somewhat reddish, and it be shewed to the priest;
20
And if, when the priest seeth it, behold, it be in sight lower than the skin, and the hair thereof be turned white; the priest shall pronounce him unclean: it is a plague of leprosy broken out of the boil.
Deuteronomy 28:27
The LORD will smite thee with the botch of Egypt, and with the emerods, and with the scab, and with the itch, whereof thou canst not be healed.
Deuteronomy 28:35
The LORD shall smite thee in the knees, and in the legs, with a sore botch that cannot be healed, from the sole of thy foot unto the top of thy head.
Job 2:7
So went Satan forth from the presence of the LORD, and smote Job with sore boils from the sole of his foot unto his crown.
Revelation 16:2
And the first went, and poured out his vial upon the earth; and there fell a noisome and grievous sore upon the men which had the mark of the beast, and upon them which worshipped his image.