What is the first action taken when treating a cut or gash on a person's arm?

The first action taken when treating a cut or gash on a person's arm is to wash the cut with soap and water. This step is vital because it helps to remove any dirt, debris, or bacteria that may be present in or around the wound. Proper cleansing of the cut reduces the risk of infection, which is a significant concern with any open wound.

By using soap and clean water, you ensure that the area is disinfected, setting a good foundation for further treatment. Once the wound is clean, other treatments such as applying gauze pads can be done to protect the injury and promote healing. Leaving the cut open to air or applying ice directly to it would not be effective first lines of care, as they do not address the contamination risk associated with wounds.