Little pea sized lump on shin bone starting to hurt feels like its bruised had it for a couple of months doc said just keep a eye on it but what does that mean and what couod i be i thought we should worry about all lumps ? ?

Under the skin, we can find lumps from an enclosed skin infection, non concerning fibrous changes, a neurofibroma, and several other things. Most of the time they are of no concern. Adult fibrosarcoma is rare. You should see your doctor, on rare occasions, a doctor may want to be sure and take it out for analysis. Only a doctor in person that examines you can give you the answer you need.