If your one-year-old daughter has redness and bumps on her vulva, it is important to determine the cause as soon as possible. If it is a diaper rash, using a protective cream with a high zinc content at each diaper change may help. However, if the issue seems to be specifically localized to the vulva, it is advised to stop using any cortisone cream and seek medical advice promptly due to her young age. It is always best to consult a healthcare professional for proper diagnosis and treatment.