can be due to tinea capitis. It is contagious and can spread direct contact with someone who has the condition, or if you touch contaminated items such as combs, hats, clothing, or similar surfaces. Diagnosis is by clinical examination of the scalp as well as a skin lesion biopsy with microscopic examination. My sincere advice would be to consult a dermatologist. The other differential can be male pattern baldness which can be due to other medical causes. It is difficult to confirm a diagnosis without examination, so please get it done.
Hope it helps. Take care and please do keep me posted on how you are doing. Kind regards.