Apart from actually seeing these, it's important to know how old you are; are you male or female; and the size of most of these.
Do they ever bleed and crust? Can you pick them off with your fingernail? If you're a senior, they may be seborrheic keratoses. Often called the "barnacles of maturity." if that's what they are, they are very friendly. If you are worried, see a dermatologist.