We suggest to bring your hamster to your veterinarian. This "Red" something in his belly might be an indication of an injury or tissue protrusion that need ardent veterinary attention to avoid infection and other complications.
For the time being, we may suggest too to provide antiseptic cream to used if you suspect skin irritation under your pet's belly.
For other related information, please visit and talk to our Pet Care Consulants in all our PLC outlets.
Eliezer M. Bauzon, DVM RN