CONTACT DERMATITIS:
DEFINITION: Poison ivy, jewelry, soaps, perfumes, and chemicals
 are common causes. Typically, an itchy rash develops a few days
 after the exposure. If the reaction is severe, blisters may develop.
 Two to three weeks may be required for healing. Generally, treatment
 consists of: 1) a thorough washing with soap to remove any trace
 of the offending substance, 2) application of a cortisone cream,
 and 3) antihistamines for itching. If the reaction is particularly
 severe, further measures may be required. These can include soaking
 in epsom salts or Burrow's solution, and oral cortisone medications.
 Call the doctor if the rash is worsening despite treatment, or
 if signs of local infection develop (increasing redness, swelling,
 tenderness, or fever).