Hello and welcome to e health forum.
The description of your hair loss appears to be due to Alopecia areata.
Alopecia Areata is a hair loss condition characterized by the rapid onset of hair loss in a sharply defined area. Hair loss occurs because the hair follicles in a discreet area all enter the telogen or late catagen stage of hair growth. In the catagen stage the hair follicle stops growing and in the telogen stage it falls out.
The progress of alopecia areata is unpredictable. In the majority of individuals, with little hair loss, as in your case, observation for a few months can be done, as the hair is expected to regrow completely within 1 year without any treatment. Other options include prescription medications of topical steroids (eg Diprolene or Temovate).
You may consult with your dermatologist who can examine you and advice you accordingly.
I hope this helps.