Hi Pollaidh, I am allergic to the preservative found in many every day items, perfume, that is in anything including soap shampoo, face creams, polish, washing powder, body lotions the list is endless but a topical cream I was allowed to use on my face was cuteivate, it is a very weak steroidal cream, steroid cream thins the skin and should be avoided if possible on the face and neck. I used it on my DGD but her eczema was on her leg, and it made her more comfortable and calmed everything down very quickly.
Is it possible to ask the dermatologist for allergy testing, I am allergic to light UVA and UVB and I have polymorphic eczema, I was in my late 40's before this was properly diagnosed. Now I check ingredients list on all products to avoid the preservative I am allergic to. I had only been tested on the usual pollens and animal things before.
Hope this helps