As the name suggests, chilblains develop as a response to cold. They often appear on your extremities – such as your nose, earlobes, fingers and toes – which tend to be more vulnerable to the cold. Chilblains tend to be very itchy and may be accompanied by a burning sensation.
Chilblains start as red lumps that can be painful and tender, and sometimes these lumps can blister. Chilblains will typically last about seven days and will heal on their own. However, if a blister or ulcer forms, there is a risk of infection. Some people will get chilblains each winter and should take extra care to keep their extremities as warm as possible.
Source: NHS choices