I have EHK also and have used tazorac, in fact I took part in the testing trials for this drug. It worked well on most of my body, especially my chest and arms. It did not work at all on my hands and feet. It did give me a chemical burn one time from using it on skin that was to new, took forever to heal. I want to tell you what Dr. Williams told us in the EHK breakout group. Tazorac is not meant to be used to cover your whole body at one time, and not to be used everyday either. According to the doctor it is supposed to be used in small problem areas occasionally. In fact I have a box of tazorac in front of me and I'm going to quote exactly what it says, "Apply Tazorac gel once a day, in the evening, to psoriatic lesions, using enough(2mg/cm(squared)) to cover only the lesions with a thin film to NO MORE THEN 20% OF BODY SURFACE AREA. If a bath or shower is taken prior to application, the skin should be dry before applying the gel. Avoid application to unaffected skin.
Upon asking the retinoid expert at the conference if any retinoids were safer then the others I was told they all basically have the same risk profile and even though tazorac is a topical retinoid it can and does absorb through the skin into the blood and organs. I understand some forms of Ichthyosis are worse then others and require more then just lotions and creams but retinoids in my opinion should be used as a last resort. I, like yourself, also took oral retinoids and have permanent hip damage as well as other problems. I just wanted you to know that there is no "safe" retinoid to take, oral or topical.