Hi welcome to HCMForum. as you describe it appears to be CHICKEN POX
. If it is some thing like insect bite or boils
you would have got lot of itching and burning. in chicken pox there usually there is fever
but it is not a must. pox is a self limiting disease dont require any medicines. But to prevent secondary infection we practice giving medication for healing and analgisia. may be to prevent pruritis
if it is there. Same treatment holds good what ever the reason is. wishing for a quick recovery.