its normal to have lumps and bumps on your body. None of us are perfect and Ill bet everyone that searches for a lump, finds one, somewhere on their body.
I have been obsessing about lumps since I found my lymph nodes and have several uneplained lumps on my body. I have one on my big toe (probably from wearing high heals all the time), on on my right ring finger (probably from my wedding ring), one on the back of my right thigh (thought it was a lymph node bot doc says its just a lump, one on my belly (probably from my skin streching while pregnant) and one on my bottock (probably from a pain killer shot I got a while ago). and I have a lot of lumps on my shins...
Im not worried about those random little bumps, because I have felt similar bumps on other people (my husband has a huge on on his stomach that creeps me out). I feel them all the time, just a habit I have:)
Yours is probably "just a lump" aswell, we have those, like we have birthmarks and scars....:)