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As per your description,possible differential diagnosis may include Venous insufficiency,Stasis dermatitis,Hives,Autoimmune disorder.
Poor blood circulation in legs due to prolonged hours of sitting can be triggering factor.
You shouldn't ignore it and see your family doctor for a clinical exam and further investigations like color doppler study,blood work should be done accordingly.
If you feel warmth,tenderness on affected sites then see your doctor ASAP.
Elevate and exercise your legs.
Take breaks of walking while doing work.
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