Chilblains are a reasonably common problem of the feet in colder climates that can be quite painful. They are due to changes in the temperature of the foot from being cold to warmer too quickly for the small blood vessels to respond to this change in temperature. This sets up an inflammatory process that becomes itchy and then painful. The skin of chilblains becomes red and inflamed looking, but then takes on more of a dark blueish appearance as it becomes more chronic.
The treatment of chilblains is firstly to prevent them by wearing warm socks and shoes so that the foot does not get too cold. Once a chilblain has occurred, then you need creams and other medicaments to relive the itchy, irritation and pain. Physical stimulation by rubbing the area can help move the circulation and remove waste products that have accumulated from the inflammation in the area.
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References:
http://www.epodiatry.com/chilblains.htm
http://www.podiatryexperts.net/question/89/Anyone-got-some-advice-for-chilblains
https://www.footstore.com.au/browse-for-products-by-condition/chilblains/
https://podiatryfaq.com/knowledge-base/how-to-treat-chilblains-on-the-toes/
https://articlebiz.com/article/1052051917-what-is-a-good-cream-to-use-to-treat-chilblains