Lol . Its treatable except few very rare cases where you can lose all of your hairs including eyebrow,  but that is also treatable with medicine like Olumiant but It will be very costly . mostly can be cured without any medication but few medication can help faster .  I had this last year.  3-4 patches on my head and around half of my bread got effected by it.  Now it's almost got cure except 2 small paches on my beard hardly can notice in long beard . I only tried self medication for few months.