For three months my skin has been producing these sand like particles on my face, scalp and neck. It has spread to my chest and causes a sting like bite, that looks like a mosquito bite or fire ant bite. It itches swells up and then goes back down, then reappears at a later time. The sand like particles seemed to originate from my scalp. I have been to a derm twice now and he prescribed steroids, first an injection that didn't help at all, then Desowen lotion that did help, but after two weeks as soon as I stopped using the lotion they came back with a vengence. The bite like rashes are spreading and I am finding more and more sand like particles. I need help or at least and identification of this disorder. Thank you.