Hi Jill
The same thing happened to me with Avon makeup. I'd worn the same Avon makeup for years and then all of a sudden I developed an allergy. It took me awhile to realize that it was the makeup and not my eyeshadow or moisturizer. When I contacted the company they sent me the list of ingredients in the makeup (holy cow!! it was 1/2 a page of small type) and said they'd not made any recent changes to the formula. For a couple years I used Almay and Marcelle with no problems and have recently used L'oreal with no problem either. I haven't tried Avon again though.
Carole