Hello,
Applying salicylic acid will not cause decreased facial hair. Temporary hair removal can be achieved through depilation or epilation. Drugs like androgen receptor blockers, androgen suppressing agents and 5 alpha reductase inhibitors are also used. Permanent means of hair removal by electrolysis and laser treatment are also useful. I would suggest you to consult a dermatologist and discuss all the pros and cons of these methods so that the best treatment for you can be decided.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your dermatologist. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
I'm not sure either with repeated use. This is a good ?.
C~