I am a bit of a quiet lurker, but thought I'd contribute since I've just recovered from this myself.
I had a strang crusty rash on my eyelids. I tried everything to fix it. When it spread to my eyebrows and the crease in my neck, I went to the dermatologist. She diagnosed it as seborrhic dermatitis as a result of an environmental allergen and told me to wash my face with Neutrogena T-gel shampoo. I had been using Oil of Olay products for years. I washed my face with the t-gel for a couple of days and woke up one morning with the rash spread all around my eyes like a raccoon. It was kind of frightening.
After a Google search, I went out and bought Toleriane face wash and moisturizer. That's all I use. The whole mess cleared up in a week, even the stuff that had been there for six months. I must have developed a sensitivity to the oil of Olay, and obviously do not do well with the dandruff shampoo either.
The Toleriane is pricy, but I only use a little and CVS gives me coupons for it frequently. Hope this helps.