Dermatitis, an allergic disease with red, sore itchy rashes was caused by exposing skin to things like chemicals, medications, certain plants, jewellary, fragnance, cosmetics, metals, creams, etc.
The July issue of Mayo Clinic Health Letter lists the top 10 causes of contact dermatitis that were recently identified by Mayo Clinic researchers:
Nickel, commonly found on jewelry clasps or buttons
Gold, usually worn as jewelry
Balsam of Peru, a fragrance used in skin care products and perfume
Thimerosal, a preservative used in vaccines
Neomycin sulfate, a topical antibiotic
Fragrance mix, which is comprised of eight of the most common flavorings found in various products
Formaldehyde, a preservative that can be found in paper products, paints, building materials, medications, household cleaners and fabric finishes
Cobalt chloride, a metal found in medical products, hair dye, antiperspirants, and in snaps, buttons and tools
Bacitracin, a topical antibiotic
Quaternium-15, a preservative found in skin care products and in industrial products such as paints, polishes and waxes
Skin allergy patch testing can confirm allergies to these substances.