Fragrance

Parfum, masking terms, EU 26 allergens, essential oils

Preservatives

MI, MCI, formaldehyde, DMDM hydantoin, imidazolidinyl urea, and other formaldehyde-releasing preservatives

Lanolin & derivatives

Wool wax, adeps lanae

Contact sensitizers

Balsam of Peru, Colophonium, Cocamidopropyl betaine, Propylene glycol, Neomycin, PPD

Metals

Nickel, cobalt, chromium (often present in pigments)

Synthetic dyes

FD&C / D&C / CI numbers

Why these specifically?

The list mirrors the National Eczema Association's "ingredients to watch" guidance and the most commonly positive allergens on standard patch-test series for atopic patients. The tool is a first filter — for confirmed allergy diagnosis, see a board-certified dermatologist for patch testing.

Is this a substitute for patch testing?

No. Patch testing identifies your specific triggers. This tool flags ingredients that are commonly problematic for eczema patients. Many patients tolerate some flagged ingredients fine.

Does this check for everything in the National Eczema Association Seal?

It checks the major allergen categories. The NEA Seal also evaluates pH, irritancy, and clinical testing — which we can't infer from an ingredient list alone.

Why is propylene glycol flagged?

It's a known irritant for some eczema patients, though not a true allergen for most. Mild reactivity is common, so we err on the side of flagging it.