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Any changes in legs such as increased or new swelling, pain, redness or anyother symptoms needs to be checked out and also to exclude blood clot in the legs.
It could just be a circulation problem, but without being checked out,no one knows
For insurance company purposes, your own GP would have to do a letter or you can use online services such as babylon or doctor care anywhere, however you should not let this delay trying to get seen today.
You should be patient, its a saturday so maybe your GP dont open on saturday but your private GP might respond later, but not just anyone can do letter and we dont provide that kind of service