The following information may help to address your question:
There are several recent studies showing that a class of medication known as JAK inhibitors, which includes Tofacitinib and Ruxolitinib, are effective in alopecia areata, including AU. However, JAK inhibitors have not yet been approved by the FDA for use in skin conditions.
In some people with AU, hair regrowth occurs without treatment, sometimes after many years.
There are steps that can be taken to decrease the chance of getting too much sun and minimize other discomforts related to having no hair. These may include: