The Lord will smite thee with the botch - שחין shechin, a violent inflammatory swelling. In Job ii., one of the Hexapla versions renders it ελεφας, the elephantiasis, a disease the most horrid that can possibly afflict human nature. In this disorder, the whole body is covered with a most loathsome scurf; the joints are all preternaturally enlarged, and the skin swells up and grows into folds like that of an elephant, whence the disease has its name. The skin, through its rigidity, breaks across at all the joints, and a most abominable ichor flows from all the chinks, etc. See an account of it in Aretaeus, whose language is sufficient to chill the blood of a maniac, could he attend to the description given by this great master, of this most loathsome and abominable of all the natural productions of death and sin. This was called the botch of Egypt, as being peculiar to that country, and particularly in the vicinity of the Nile. Hence those words of Lucretius: -

Est Elephas morbus, qui circum flumina Nili

Nascitur, Aegypto in media; nec praeterea usquam.

Lib. vi., ver. 1112.

Emerods - עפלים ophalim, from עפל aphal, to be elevated, raised up; swellings, protuberances; probably the bleeding piles.

Scab - brg garab does not occur as a verb in the Hebrew Bible, but gharb, in Arabic, signifies a distemper in the corner of the eye, (Castel)., and may amount to the Egyptian ophthalmia, which is so epidemic and distressing in that country: some suppose the scurvy to be intended.

Itch - חרס cheres, a burning itch, probably something of the erysipelatous kind, or what is commonly called St. Anthony's fire.

Whereof thou canst not be healed - For as they were inflicted by God's justice, they could not of course be cured by human art.

the botch

Deuteronomy 28:35 The LORD shall smite you in the knees, and in the legs, with a sore botch that cannot be healed...

Exodus 9:9,11 And it shall become small dust in all the land of Egypt, and shall be a boil breaking forth with blains on man, and on beast...

Exodus 15:26 And said, If you will diligently listen to the voice of the LORD your God, and will do that which is right in his sight...

emerods

1 Samuel 5:6,9,12 But the hand of the LORD was heavy on them of Ashdod, and he destroyed them, and smote them with tumors...

Psalm 78:66 And he smote his enemies in the hinder parts: he put them to a perpetual reproach.

scab

Leviticus 13:2-8 When a man shall have in the skin of his flesh a rising, a scab, or bright spot...

Leviticus 21:20 Or hunch back, or a dwarf, or that has a blemish in his eye, or be scurvy, or scabbed, or has his stones broken;

Isaiah 3:17 Therefore the LORD will smite with a scab the crown of the head of the daughters of Zion, and the LORD will discover their secret parts...

The Sin of Unbelief
However, the lord on whom the king leaned expressed his disbelief. We hear not that any of the common people, the plebeians, ever did so; but an aristocrat did it. Strange it is, that God has seldom chosen the great men of this world. High places and faith in Christ do seldom well agree. This great man said, "Impossible!" and, with an insult to the prophet, he added, "If the Lord should make windows in heaven, might such a thing be." His sin lay in the fact, that after repeated seals of Elisha's …
Charles Haddon Spurgeon—Spurgeon's Sermons Volume 1: 1855

Paul's Departure and Crown;
OR, AN EXPOSITION UPON 2 TIM. IV. 6-8 ADVERTISEMENT BY THE EDITOR How great and glorious is the Christian's ultimate destiny--a kingdom and a crown! Surely it hath not entered into the heart of man to conceive what ear never heard, nor mortal eye ever saw? the mansions of the blest--the realms of glory--'a far more exceeding and eternal weight of glory.' For whom can so precious an inheritance be intended? How are those treated in this world who are entitled to so glorious, so exalted, so eternal, …
John Bunyan—The Works of John Bunyan Volumes 1-3

The Voice of Stern Rebuke
[This chapter is based on 1 Kings 17:8-24; 28:1-19.] For a time Elijah remained hidden in the mountains by the brook Cherith. There for many months he was miraculously provided with food. Later on, when, because of the continued drought, the brook became dry, God bade His servant find refuge in a heathen land. "Arise," He bade him, "get thee to Zarephath, [known in New Testament times as Sarepta], which belongeth to Zidon, and dwell there: behold, I have commanded a widow woman there to sustain thee." …
Ellen Gould White—The Story of Prophets and Kings