Do you have an itchy scalp that just won’t go away? It’s a frustrating condition that can be caused by many factors. From dandruff to allergies, it’s important to identify the root causes of scalp itching and take steps to reduce the irritation. There are several common causes of an itchy scalp, such as psoriasis, contact dermatitis and seborrheic dermatitis. Psoriasis is an autoimmune disorder which causes skin cells to build up quickly on the surface of the skin and form scaly patches or plaques. Contact dermatitis is a skin reaction due to direct contact with something like shampoo or…