Dermatofibroma are common benign skin tumours that cause lumps in the skin and frequently cause concern upon discovery. The causes of dermatofibroma may include a reaction to trauma such as insect bites but the precise cause is often unclear.
Causes. It's not clear what causes simple kidney cysts. One theory suggests that kidney cysts develop when the surface layer of the kidney weakens and forms a pouch (diverticulum). The pouch then fills with fluid, detaches and develops into a cyst. 1  Symptoms. 2  Risk factors.
Article Excerpts About Symptoms of Simple kidney cysts: Most often, simple cysts do not cause symptoms or harm the kidney. In some cases, however, pain can occur when cysts enlarge and press on other organs. Sometimes, cysts become infected or suddenly start to bleed. Less often, the cysts impair kidney function.Simple cysts can also cause high blood pressure.rticle Excerpts About Symptoms of Simple kidney cysts: Most often, simple cysts do not cause symptoms or harm the kidney. In some cases, however, pain can occur when cysts enlarge and press on other organs. Sometimes, cysts become infected or suddenly start to bleed. Less often, the cysts impair kidney function.