Suggest Remedy For Itching And Swelling In A Diabetic Person

Question: I just spoke with my diabetic 93-year-old mother, who lives alone out of state, and was exposed to toxins while clearing away rusted containers on her late husband's work bench. She thought it was the rust that caused the itching and swelling, and was willing to ride out the pain.
"One label read ??? hydro cloric acid ???" I found out about the swelling, and terrible itching two weeks later!!! She didn't want to mention it so I wouldn't worry!!! After asking her what she would tell her grandson if he had the same thing happen to him ... or to me ... what would she tell us. After a short pause--she said she would drive over to the emergency clinic at the end of our telephone call. Something like a Medrol-Pac was given to her with decreasing dosage; she has two pills left. Today, Tuesday, she was tormented enough to go back to the clinic. They arranged for her to see her family doctor this Friday.
She also says they measured her temperature at 198 F. .... I said surely this is 100.98.
She is strongly of the opinion it is 198 F and she is to return if it goes up to 200 F. ... Yes, she would be dead already.
I could only suggest she drink plenty of water/fluids throughout the day and night until her appointment.
She is in Michigan; I am in Florida residing with my husband and 103.5 year old mother-in-law.
My mother will reside with us sometime in the future; for now ... my mother-in-law is very healthy.