Which is a sign that a diver may be experiencing DCS?

A sign that a diver may be experiencing Decompression Sickness (DCS) is blotchy skin. This condition can occur when nitrogen bubbles form in the body tissues due to rapid ascending or not adhering to proper decompression protocols. When these bubbles inhibit blood flow or cause damage to the tissues, it can lead to skin manifestations, including a blotchy or mottled appearance. This particular symptom is associated with the inflammatory response or the presence of gas bubbles in the skin itself, which can create a visible pattern.

While other symptoms like bright white skin, elevated heart rate, and blurred vision can be associated with various diving issues, they are not specific indicators of DCS. Bright white skin may suggest a lack of blood flow or shock, elevated heart rate might result from anxiety or exertion, and blurred vision can come from various factors including fatigue or other medical issues. However, blotchy skin directly correlates with the physiological effects of DCS and is a more distinctive and recognizable sign that warrants immediate attention from fellow divers or medical personnel.