It could be a couple of different things. Firstly it make be that the scar tissue is becoming tight and that starts to pull on the skin/ other tissues affected and causing this pain. This would potentially worsen in the cold as your tissues tend to tighten up more then and so that could worsen it. If it's just your skin then massaging the scars, maybe using a bit of cocoa butter, bio oil or vit e cream may help.
Also, it could be that you've damaged a nerve(s) and that's sending the shooting pains across and these are often (though not always) worse in the cold. There isn't really anything you can do at home to help this.
Really as it sounds like it's been going on a while it is probably worth your talking to your GP who can assess you and decide where to go next and help diagnose what the actual problem is. It may be that a specialist scar tissue physiotherapist could help or then there's trying medications or even surgery but there is likely somthing that will help.
I would suggest that it is unlikely to be a neuroma. This is a tumour of the nerve and as this is an area that is scarred then the scar tissue is much more likely to be the primary cause rather than a tumour which is somewhat further down the list of possibilities below something doing on with the muscles (which I also haven't mentioned).
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