I was prescribed betamethasone lotion to try and save some of my hair follicles. When will I know if it's working?

It may take several months to see results. Keep in mind, usually a combination approach is needed. I do prp with progesterone injections to get the best results with hair growth and quality. I also have all my patients use viviscal, rogaine, and propecia. I recommend getting a formal evaluation with a hair loss expert. Best, Dr. Emer

The follicle is about 1/4" inch deep. I would say you should see regrowth in 3 weeks if it's going to work. I would look into Youth-if-I (or similar) hair vitamins and Nigella sativa (aka black seed) for its autoimmune help. You want to give the hair follicles all you can to support them. Hoping it works great and grows in just a week! 

Betamethasone is a topical corticosteroid that reduces inflammation. There are many forms of betamethasone including betamethasone valerate and betamethasone diproprionate. These treatments may reduce inflammation and in turn stop (or reduce the rate) the scalp from forming more scars. It is important to be aware that the lotion may or may not be the only treatment that is required. Frequently more than one treatment is needed in active scarring alopecia. In other words, use of the lotion alone doesn't always stop in completely. You'll want to have close follow up from your dermatologist. The main goal for anyone with scarring alopecia is to stop further loss. Regrowth is not usually possible. Topical steroids of stronger potency (ie clobetasol) as well as steroid injections and oral medications may be needed.  For lichen planopilaris, use of steroid injections and oral anti-inflammatory agents (doxycycline, hydroxychloroquine) are frequently needed.