What should be done first when treating a casualty with a chemical burn?

When treating a casualty with a chemical burn, the first action should focus on decontaminating the affected area to prevent further injury and reduce the potential systemic absorption of the harmful agent. Submerging the affected area in water is an effective and immediate response to dilute and wash away the chemical agent, thereby minimizing tissue damage and enhancing healing.

It's important to recognize that topical creams may not be suitable for immediate treatment of chemical burns, as they can trap the chemical agent against the skin instead of removing it. Calling for specialized help is generally good practice, particularly if the chemical involved is unknown or highly toxic, but it should come after the immediate life-saving response. Covering the area with a dry dressing may be applicable later in the treatment process, but it is not the immediate response when managing a chemical burn. Promptly flushing the area with water is essential to address the burn as quickly and effectively as possible.