I am 42, 5'5" and I weigh around 145. I have Fibromyalgia, severe scoliosis, osteoporosis, and degenerative arthritis (please forgive my misspellings) I went to the urgent care yesterday and was diagnosed with shingles on my scalp and face, but there is also a hard but movable pea-sized lump under the scalp that hurts. It's not filled with liquid, and it's not opening like the other blisters. What is it?