What should be done to a person whose skin has been in contact with a toxic substance?

When a person's skin has been contaminated with a toxic substance, the immediate step is decontamination. This process involves removing the harmful substance to prevent further exposure and reduce the risk of absorption through the skin. Decontamination may include rinsing the affected area with copious amounts of water to wash away the toxic substance, or using soap and water if appropriate. The goal is to eliminate any residue that could continue to harm the individual or further exacerbate their condition.

In contrast, simply waiting for help to arrive could allow the toxin to continue affecting the person, potentially worsening their health. While medical attention is crucial, it should come after decontamination to mitigate the risks associated with exposure. Likewise, while applying a topical cream may relieve irritation, it does not address the underlying issue of the toxic substance on the skin and could potentially trap the toxin against the skin, leading to further complications. Thus, initiating decontamination is the most critical and immediate action.