It sounds like keratosis pilaris.  It's a condition where the skin around
the hair follicles doesn't shed as it should.  Check out these sites:

http://www.reddingdermatology.com/keratosispilaris.htm
http://www.mayohealth.org/mayo/9609/htm/bump_qa.htm
http://www.drkoop.com/conditions/ency/article/001462.htm

It's not milk or diet related, just genetics.  The only treatments are
those that help the skin shed more easily...AmLactin or LacHydrin (check
the lactic acid source if you know he has a milk allergy), glycolic acid
products, and salicylic acid products (Neutrogena Clear Pore Treatment).

On Wed, 6 Sep 2000, Elizabeth Jasper wrote:

> Since infancy, my now 9-year-old grandson has had small, hard bumps on his
> cheeks and upper arms.  My daughter (his mother) has always said they were a
> reaction to dairy products, and I assumed she had this out from a doctor.
> Come to find out, a neighbor with a similarly affected grandchild told her
> what she thought it was and she just accepted the diagnosis.
>
> Is anyone familiar with this condition?  Is it dairy related? Is there
> medication, either traditional or alternative that might help it? I guess I
> have more than one question after all. :O)
>
> Thanks,
>
> Elizabeth