True regarding crohn\'s disease are A/E –
The skin involvement in Crohn's disease causes erythema nodosum, scleroderma does not occur in Crohn's disease.
Other extraintestinal manifestations of Crohn's disease:


Migratory polyarthritis                                                                                                                                                        
Uveitis 
Clubbing 
Sacroiliitis
Hepatic pericholangitis    
Renal stones (uric acid & oxalate)
Ankylosing spondylitis
Primary sclerosing cholangitis
Scleroderma
Transmural involvement
Cobble stone appearance
Skin involvement