True regarding Crohn's disease are all except
Scleroderma
Transmural involvement
Cobble stone appearance
Skin involvement
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:
1. Migratory polyarthritis           
2. Sacroiliitis 
3. Ankylosing spondylitis    
4. Uveitis
5.. Hepatic pericholangitis        
6. Primary sclerosing cholangitis
7. Clubbing