I have bumps on arms that are similar to pimples. Can not be popped I've tried scratching them off but nothing really works some around back as well. Dad has it too and his sister does as well mostly on arms.
Could be keratosis pilaris also known as "chicken skin". I had this symptom due to vitamin A deficiency (in my case the deficiency was due to hypothyroidism). Keratosis pilaris can also be due to omega 3 deficiency.