It's not infected if it's not red. It is normal for your tattoo to scab. Don't pick it, let it fall off naturally. Wash it and use Vitamin A-D ointment (found in the baby section in Target) on it a couple times a day and it will be fine.
its part of the healing process... the scabbing is going to happen no matter what, just make sure not to pick at it. i've used diaper rash cream on mine to keep it moisturized, which has worked really well