Treating your small pet, like a hamster, guinea pig or mouse, at home can be difficult. Parts are small, and these animals are extremely skittish when hurt. They can even snap and bite at you.
There are measures you can take at home to help your pet before you take them to a veterinarian. Small cuts probably don’t need to be treated professionally, but remember that your small animal doesn’t have a lot of blood volume. So, if you’re in doubt, take him to the vet.
At home, hold or secure your pet firmly (but not too tight!) by wrapping him in a clean towel. Use the body of a syringe (without the needle) to flush the wound with saline or clear water. Dry with gauze and apply an antibiotic ointment. Keep him isolated from other pets until the wound heals.