It is not clear whether the spots are raised or flat. However the possibilities of pityriasis veriscolor, vitiligo, folliculitis, molluscum contagiosum, heat rash and viral infections( if they are itchy) need to be ruled out. Molluscum contagiosum is a common, benign, self limiting viral infection of the skin. It generally affects children and typically occurs in the 2-5 age group. Folliculitis starts when hair follicles are damaged by friction from clothing or blockage of the follicle. In most cases of folliculitis, the damaged follicles are then infected with the bacteria Staphylococcus (staph).
I suggest you to consult a dermatologist and get it evaluated.
I hope it helps. Take care and regards.