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If the patch is smooth with no scales or itching then it is called ALOPECIA AREATA
,and if it is itchy and has scales in it then it is a fungal infection(TINEA BARBIE).It is important to differentiate between the two conditions.For either of this you should meet a good dermatologist
for treatment.Alopecia areata(AA) if not treated can involve whole of beard area or even scalp and body hair to lead to complete baldness
.So take immediate treatment.Options for treatment are injection given on the spot,topical creams ,oral steroids
to irritants which can help hair growth .AA can usually be associated with stress or other auto immune ds like thyroid
problem.So get that checked too.Ifit is fungal then it can be treated with antifungal creams and tablets.