If your 2-year-old child has small red bumps around the mouth and on the buttocks, it is important to monitor the situation closely. Rashes in young children can often be common and may come and go without a clear cause. However, if the rash persists or worsens, it is best to seek advice from a healthcare professional, such as a doctor or pharmacist, for a proper diagnosis and treatment. It's always important to prioritize your child's health and well-being in such situations.