<unk>  it typically diagnosed by patch testing – applying a patch with 2.5% (in North America) or 5% (in Europe)<unk>  sulfate to the upper back and looking for irritation on the skin. As with other causes of allergic contact dermatitis, patches containing several common allergens are typically applied to the back for 48 hours, removed, then the spots examined for allergic reactions 2 to 5 days later.
Nickel allergy
Dust mite allergy
Sesame allergy
Tree nut allergy
Metal allergy
Garlic allergy
Peanut allergy
Insect sting allergy