Hi Claire
Occasional burning sensation as insulin goes in but no lumps. However, years ago the old cow insulin would leave hollows on my legs after injecting in them over a period of time. Changing to Pig was better for me.
Its amazing how insulin has changed over the years though. When I first became diabetic I was put onto a mixture of 30/70 strengths which depending upon the dose had to be calculated using the 4 x table (thankfully my dad was good at maths)