What is identified as the cause of Seabather's Eruption, commonly known as sea lice stings?

Larvae of jellyfish or anemones trapped in swimwear

Seabather's eruption, frequently referred to as sea lice stings, is often mistaken for a true coral sting but has a distinct etiology. This reaction is specifically attributed to microscopic organisms, namely the larvae of certain jellyfish or anemones. The mechanism of injury occurs when these tiny larvae become inadvertently trapped against the skin, usually beneath tight-fitting swimwear or wetsuits. Once trapped, they continue their development or release irritants, leading to symptoms that mimic other marine stings, ranging from mild itching to significant blistering. The overall duration of this specific type of rash is heavily dependent on how quickly and completely these trapped larvae are subsequently eliminated from the clothing and skin, as the source of irritation must be physically removed for healing to commence effectively.