They are most probably not pimples. Itchy scalp along with raised lesions are common on the scalp. Do you wash you hair routinely with shampoo? You should and not vigorously but gently. And only an anti fungal shampoo will not help you . You might need topical steroid applications. So visit a dermatologist and get a proper prescription. It is unsafe to use steroids without a doctor's advise. Please do not try any home made remedies or use creams suggested by friends or family or pharmacists .