I am writing on behalf of my father in law.  He has has a chronic itchy rash for the last two years. It has gotten progressively worse.  He has been to a dermatologist and it does not seem be be an allergy.  He has been tested for many.  I am concerned because the scratching has cause him to bleed. Not just in on spot but many spots.  His back has dime sized bumps but his legs have large angry patches that are bloody and some look black.  I think I should make an appointment with an endocrinologist.  Would this be the correct path?
Hello, Intensive itching causes eczema of the skin on that area. If the dermatologist are not able to come to a conclusion then there any be any non-dermatological cause to itching. You may do 1. Liver function test to rule out Hyperbilirubinemia. 2. Renal function test to rule kidney disease.3. Hyperthyroidism is one endocrine condition which causes itching. Do a thyroid function test. You may consult an endocrinologist.