What auto immune disorder causes abnormal tissue thickening?

Scleroderma is an autoimmune disorder that causes abnormal tissue thickening, primarily affecting the skin and connective tissues. It results from an overproduction of collagen, leading to stiffness and changes in the skin and internal organs. Symptoms can vary widely, ranging from mild skin changes to severe complications involving the lungs, heart, and digestive system. Early diagnosis and treatment are crucial for managing the condition and improving quality of life.