Mine are small red dots primarily, though at the beginning, they were large. Typically now they vary in size, texture, etc. I went online to find out that, in fact, urticaria
can be a serious side-effect of Phentermine. I went to my weight loss doctor, and he told me that my urticaria was stress-related. Even though it is a well-documented side-effect of Phentermine, my GP also stated that these hives were idiopathic and possibly stress-related, two diagnoses I can live without.