Forrest 1b and coagulum
Acute hemorrhage
Forrest I a (Spurting hemorrhage)
Forrest I b (Oozing hemorrhage)
Signs of recent hemorrhage
Forrest II a (Visible vessel)
Forrest II b (Adherent clot)
Forrest II c (Flat pigmented
haematin
on
ulcer
base)
Lesions without active bleeding
Forrest III (Lesions without signs of recent hemorrhage or fibrin-covered clean ulcer base)
Source: Wikipedia