I have the same white spots

, if there small and underneith your skin they're nothing to worrie about. Their called Fordyce's and there suprisingly common in males and Some females. the rash i have no idea what that could be but i'd ask somebody to help you. I asked my Uncle as i know i can talk to him.
let me know if this help's. ive had them since i was around your age and im 18 still got them, my GF knows as i told her today

but shes okwith it.