I just started making homemade lotions and creams for personal use and give to friends. My first batches were used up quickly(I made smaller quantities ) Anyways, I got bigger jars on sale- I think 16 oz For the first time I had a very bad reaction when I used my lotion. It was oatmeal honey and had turned a yucky brown but I had that problem before and assumed it was because I didn't use a stablizer for the vanilla in it. However, I am now wondering if something had gone wrong with my body cream because I don't use preservatives either and this body cream has taken me over a month to use( I have several different scents) Questions: 1. Should I use a preservative and not even sure what to use or where to buy 2. Could my rash have been caused by mold or something from not using it? Thanks for any advise