and fibromyalgias are two different entities the present complaint pain in the lower spine from top of the buttock to the lower end of spine with redness
over that area probably suggests some infectious/ inflamatory lesions. Do you have any drug allergies? Did you have any history of painfull vesicles over the buttock area which probably suggest herpes infection. Do you history of weight loss
fever and increase in the pain during the nights which probably suggests tuberculous involvement. Any history of trauma? Kindly take an x-ray lumbosacral AP and lateral views to check for any lumbar spondylosis
and consult a neurologist
for opinion and he may ask you if needed an MRI.