Which skin condition is characterized by fluid accumulation in tissues?

The condition that is characterized by fluid accumulation in tissues is edema. Edema occurs when there is an excess of fluid in the interstitial spaces of the body, leading to noticeable swelling in the affected areas. This can happen as a result of various factors, including injury, inflammation, or other medical conditions that affect the circulatory system or kidney function.

In contrast, hyperkeratosis refers to a thickening of the outer layer of the skin, often in response to friction or irritation. Psoriasis is an autoimmune condition that leads to rapid skin cell turnover, resulting in thick, red, scaly patches on the skin. Eczema is a term for a group of conditions that cause skin inflammation, resulting in itchy, red, and dry skin, but does not primarily involve fluid accumulation in tissues.