I've been battling recurring sores on my arms and legs for about 18 months now. The sores start as red, itchy bumps that soon become inflamed, then thicken, bleed when scratched, and then leave a scarring mass when healed. I thought it might be cellulitis, but I went through a cycle of antibiotics and it still persists. Also, the sores appear in matching spots on my upper triceps, lower arms, and lower front calves. In addition, I also tend to get scalp sores, but I believe they are different as they do not scar. I'm 54 and live an exrtremely healthy lifestyle with great diet and exercise. Any suggestions as to what this might be?