I have been taking gabapentin taking gabapentin for about four months for pain prescribed by doctor. In the last few days I have had , what looks like hives, on different parts of my body. Very itchy, bumps. That seem to get relief by taking a hot shower, but come back in different areas. First behind arms , belly , now the back of my legs. Is it possible that I haven t had side effects until now? I have no allergies.