TAKE A BATH

1. The blanks in the flat below can be filled in with two words that differ only by their second letter, as the key words suggest.

I MYTH, and so I took a bath.
Hot water soothed me, and I MATH

2. The keywords in this flat can be answered with two words that end with the same sound, though not the same letters. The first word has five letters and the second has six, as the keywords indicate.

"Is this a FIVE or just a cyst?"
"The SIX," replied the internist.

HINT:
2: Bad news from the doctor.

Answers:

1)
I ACHED, and so I took a bath.
Hot water soothed me, and I AAHED.

2)
"Is this a TUMOR or just a cyst?"
"The FORMER," replied the internist.*
 
Credit:
The Enigma 
NPL Magazine
September, 2019
LEXMAN 

*The Enigma calls this a PHONETIC FALSE DOUBLE because it sounds like TWO-MOR and FOUR-MER.