(HealthDay News) — Allergic reactions are sensitivities to allergens. From animal dander to foods, allergens may cause hives, itching, a rash and other symptoms.

For a mild-to-moderate reaction, MedlinePlus mentions these first aid steps:

  • Calm and reassure the person having the reaction.
  • Try to identify the allergen and have the person avoid additional contact with it.
  • If the person develops a rash, apply cool a compress and hydrocortisone.
  • Watch the person for signs of increasing distress.
  • Get prompt medical help.

If the allergic reaction is severe, call 911 immediately.