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  Allergic contact dermatitis (ACD) is a form of contact dermatitis that is the manifestation of an allergic response caused by contact with a substance. The rash isn't contagious or life-threatening, but it can be very uncomfortable. Many substances can cause such reactions, including soaps, cosmetics, fragrances, jewelry and plants. SYMPTOMS  Contact dermatitis usually occurs on areas of your body that have been directly exposed to the reaction-causing substance — for example, along a calf that brushed against poison ivy or under a watchband. The rash usually develops within minutes to hours of exposure and can last two to four weeks Signs and symptoms of contact dermatitis include:  ● A red rash  ● Itching, which may be severe  ● Dry, cracked, scaly skin  ● Bumps and blisters, sometimes with oozing and crusting  ● Swelling, burning or tenderness  When to see a doctor See your doctor if:  ● The rash is so uncomfortable that you are losing sleep or are distracted from your daily a