I did use whole beans and ground them myself. I got rashes, went to the doctor, they found nothing. A cream worked, made it for away for a little while, and I only had to use the cream a couple of times a month.

Two years after my rashes appeared, on a Sunday morning, I had a cup of coffee. I then had to throw up. Felt perfectly give afterwards, but the coffee smelled and tasted like shit. Googled, and it turns out it was sudden coffee aversion.

About a month later, all my rashes were gone. Have not drunk coffee in 3 years, and no rash problem! My hypothesis is that I got it from drinking too much coffee, as I drank nearly 2 litres a day... The only thing I miss is coffee and Baileys/Sheridans.