Minoxidil helps to grow existing hair faster? I went to hairdresser and she burned my hair.

Minoxidil won't help the existing hair grow faster, but it helps the areas that are suffering from lack of hair. If you have a burn on your scalp PRP or finasteride can help as well. It is better if you see a hair expert first.

Of course this is only true if the hair is burned.  If the scalp has suffered a second or third degree burn then the follicles my be damaged.  Depending on the size of the area you may have to wait 6-9 months to see.  Try to be patient and see what happens.  In the meantime Minoxidil and possibly one of the laser caps may be an adjunct.  Good luck, Dr. Schuster in Boca Raton

If it is just the hair that was burned, then no. No treatment will help and only time will help. Hair shafts themselves are not living and so burned hairs can not regenerate. However, if the scalp itself was burned- that is a completely different scenario and requires urgent attention by a physician. Scalp burns from salons are serious and require (in some cases) various types of anti inflammatory treatments to stop inflammation. Some scalp burns can cause permanent hair loss- however burns to the hair only do not cause permanent hair loss. Please see a physician if concerned. A full examination is needed.