(Since the complete graph 
  
    
      
        
          
            
              K
              
                7
              
            
          
        
      
    
    {\displaystyle {\mathsf {K_{7}}}}
   can be embedded on the torus, and 
  
    
      
        χ
        (
        
          
            
              K
              
                7
              
            
          
        
        )
        =
        7
      
    
    {\displaystyle \chi ({\mathsf {K_{7}}})=7}
  , the upper bound is tight.)
Digitate or Filiform warts are warts that often appear on the eyelids, lips, face, or neck. The warts tend to grow directly outwards from the skin. They have a spiky, thread-like or finger-like appearance. They sometimes look and feel like tiny brushes, making them especially uncomfortable for the patient.As with other wart types, a number of treatments are available, including laser therapy, cryotherapy, salicylic acid, and other topical treatments. == References ==