General Information. Allergic dermatitis is a red, itchy rash caused by direct contact with a substance causing an allergic reaction . This commonly happens when coming into plants such as Poison Ivy or Poison Oak. It can also happen when you are in contact with substances such as formaldehyde, airborne sprays, and certain personal care products. Repeated scratching of the affected area can cause infections. Dr. Liana Abramova and her staff specialize in the diagnosis of allergic dermatitis and will help you understand and manage the condition effectively.  Call Dermatology of Virginia in Fairfax at (703) 828-7128 and schedule your appointment today