Contact dermatitis is a local skin irritation following direct exposure to offending substance. This page contains contact dermatitis pictures and brief descriptions (nickel salts, plants, shoes, chemical and natural products). Henna dye, the most popular natural hair and skin colorant, is known may induce allergic contact dermatitis. Footwear materials may contain leathers, synthetics, rubber and textile, known to cause dermatitis. Red sea coral contact dermatitis. Nematocysts - the stinging cells are known as toxin-releasing bodies. Skin areas of direct contact are affected with itching and irritant skin reactions.