Thank you for that information as this helps me to be able to help you better. This sounds like a viral infection related rash which does in most cases heal itself. Since she does not have a sore throat, high fever, it sounds like it is viral versus bacterial. This still could be chicken pox which is a viral infection that starts on the stomach, arms, or even the scalp and then spreads to the rest of the body. It does start out with a red looking rash and had a small blister looking center. As with other viral infections it heals itself although discomfort is there. Calamine lotion and children's benadryl is advised to help with the discomfort. I am also going to include a link below that explains about the different viral and bacterial infection that are the most common. Chicken pox is highly contagious but it may be related to even meningitits but she does not have some of those symptoms and leads me more toward this. If you have any further questions please let me know.
Various Children's Viral and Bacterial Virses