My experience with these type of bumps has do with being allergic to something. Joxer gets them when he eats something that he is not suppose to, like chicken, yeast, beef the list goes on. I have been dealing with this for 2 yrs now. I first started noticing them when he was 6 mos old. He has been on differnet types of food to determine what he is not allergic to. I finally have had success with a cheaper brand of food. It is put out by PetsMart. Ovenbaked Lamb. Just in the last couple of days his bumps are going away and I couldn't be happier. I have Pictures of his bumps if you would like to compare. You may email me at aelundy@netscape.net if you have any more questions.