I have pimple like bumps all over my arms and chest and shoulders, they don't itch they are just extremely imbassersing! I know its not acne.?

Keratosis pilaris. One common cause of pimple like lesions on the arms and chest is keratosis pilaris. It is due to dry skin building up around the hair follicles. Sometimes it is associated with small pustules and pimple like lesions. Use a moisturizer with Lactic Acid or urea and exfoliate will help some. The condition is inherited and is not curable.