My nephew has been diagnosed with purpura.It started with the joint pain and swelling.He has got rashes on his legs,lower back,pelvic area and swelling on his face.He also has complain of stomach pain and joint pain.He has undergone a series of blood test and kidney function test which has come out normal.Is there any specific treatment for this ? What are the precaution which we can take ? And any restrictions on diet?Are there any other symptoms that we should watch out for.?