I am a 55 year old male. Developed a rash or some kind of reaction about my low back on my right side. It was about 3X4 inches. It started about 4 days ago. No I have low back pain on the right side. Which I have had in the past. There is also swelling/numbness heading up along the right side of my spine. Not sure what I have. There was ichiness and some pain. It did not look like the pictures of poison ivy,oak or sumar or look like shingles. Although there is some localized pain at the rash it is tolerable. What do I have?