Hello,
From the symptoms that you have described it sounds like
tinea capitis(fungal infection) or ringworm of the scalp. The symptoms of Ringworm or Tinea Capitis include a dry itchy scalp, scaling, crusting, inflamed nodules, hair loss or tender enlarged lymph nodes on the neck. 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.