I'm allergic to CK and a lot of other products. It makes my scalp burn. Other products I remember now were the Bioterra curl creme and gel. I never narrowed down what it was. Since going with the more natural products, I haven't had any issues with allergies. May be a good plan for you to consider.
I also have to be very careful about what I use on my skin, etc. I have a lot of problems with things like sun screen, lotions, etc.
3a (Corkicelli), highlighted, fine, low porosity
modified CG, since April '07
CG since 3/11/08
HGs: Anything Sevi; Curly Kinks Satin Roots, Curlycue ReNew and Coil Jam; homemade FSG and okra gel; soap bars; UFD Curly Magic; Botanical Spirits Jellies, CJ Repair Me