@blueberre
The case which you cite is a case of DRESS, eosinophilia and systemic symptoms syndrome with an added granulomatous dermatitis. This is not a typical rash.
This is a reaction which can be found in reaction to drugs, supplements, even some foods, The woman in the population study of one was taking a wide variety of drugs and supplements. The report could not distinguish what might have caused her reaction. Her outpatient medications included levothyroxine, sumatriptan, topiramate, trazodone, and alprazolam. She also reported taking one supplement called “elderberry.” She eventually recalled taking 3 other supplements: Sleepwell, AlgaeCal Plus, and strontium citrate.
It seems that she was taking a double dose of the strontium citrate, 2times 680mg.; using algaeCal and strontium citrate, both which have strontium citrate in them.
I can find no records in research of links to the correct dose of strontium citrate; this one case is the only one which had any strontium citrate in its research .
To repeat DRESS syndrome can be tied to many supplements, drugs and even food.
Taking double the dose of any drug, supplement or every food or water can have terrible consequences.
We don't know what caused her reaction; we do know that she used a wide variety of drugs and supplements and seems to have at least use strontium very unwisely.
To quote Narnia: "Aslan is not a tame lion" , neither is strontium citrate or any drug or supplement a toy.