What kind of allergic skin disorder is this?

Question:

I started having a weird skin problem 4 years ago. I started getting these weird oozing pimple-like things on my forehead and back that would form into little skin ulcers that ooze and hurt. They are about the size of pimples, but they're not ***** in the way pimples are and they take a long time to heal. I rarely get pimples on my face or anywhere else. Nobody in my family has problems with acne, and that's not what I have. Although my mom was told that she had eczema. I do have problems with itching when I touch animals or grass, but the raw sores on my head don't really itch, just hurt. I started to notice they were induced by shampoo I was using. I started using natural shampoos. All the bumps and ulcers on my back disappeared. I still get some on my forehead from time to time.
What does this sound like?

Answers:
salicylate intolerance in diet

What kind of allergic skin disorder is this?

Health Resources