Which skin states amplify the stinging sensation caused by seawater's osmotic pull?

Skin that is dehydrated from sun exposure or has underlying issues like eczema or rosacea.

The severity of the stinging sensation felt when entering saltwater is significantly dictated by the current condition of the skin's natural barrier. If the skin barrier is already compromised—for instance, due to chronic dryness resulting from sun exposure, wind damage, or pre-existing conditions such as eczema or rosacea—it loses its effectiveness in repelling the osmotic forces of the seawater. A fragile barrier allows the high concentration of salt to penetrate the surface layers more readily or irritate the exposed areas more intensely. This increased penetration and irritation translate directly into a more pronounced stinging discomfort compared to fully hydrated, intact skin.