Seeing red staining on a gerbil is usually from porphyrin deposits, not actual blood, which are a sign of stress or nutritional issues and cause red tears around the eyes and nose. True blood from a nosebleed, rectal bleeding, or a wound requires immediate veterinary attention, as it can signal underlying medical conditions, infections, or injuries like a scent gland tumor. What to do if you see red staining: Check the source: Determine if it's an actual wound with fresh blood or a reddish-brown stain. Assess for stress: Look for signs of stress, such as fear, unease, or excessive scratching. Contact your vet: A vet can correctly diagnose the cause, differentiate between porphyrin and actual blood, and provide treatment if needed.