Pimple??

Ma

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​My 9 month old has 3 of these on him that showed over night. This is the onen hia arm he also has one on his shoulder and one on hos leg. ate they just pimple?