Ever since i can remeber, i've had these tiny red dots on the back of my arms the whole way up. they don't itch or don't cause any pain. cure?

Keratosis Pilaris: It's hard to diagnose rashes without seeing them personally. Most people who describe a painless non-itchy bumpy skin on the back of arms (often also occurring on thighs-cheeks, esp. in kids) that have been lifelong, are describing keratosis pilaris, which is a skin condition associated with atopy (the tendency to have allergies). Both are genetically inherited. Moisturize and leave them alone.