I have the same itchy bumps all over my scalp and a really bad patch on the back of my neck on the right side.

I read the side affects of prednisone (60 mg/day) and yup, acne is there. This really looks and feels like acne to me (If I remember rightly from my teen years!). I go to my PCP next week, so I'll have him check it!

Good luck and let us know if you find anything that works on it!