Reynauds can be a disorder by itself and commonly piggy backs onto other autoimmune diseases. My mother has it and my sister has it as well. It is important to not get your fingers and toes to the point of turning colors.
I was told once that you risk internal infection from possible nerve damage.

I ordered my mom some mitts and footies that you heat up in the microwave from a medical supply store.

Its really tough to control in air conditioning. My mom worked at a job where she would have to count out change to put in cash registers and the coolness of the coins would turn her fingers pure white.

Big Hugs to anyone who has to deal with this