Some causes of burning itchy scalps are lice, dandruff, eczema, seborrheic dermatitis and an allergic reaction, states WebMD. Lice is a common cause of itchy scalp and is mostly seen in children. Lice are parasites that feed on a person's blood.
Dandruff is another common cause of an itchy scalp and affects almost 50 percent of the world's population, notes Xovain. The condition is mostly seen in people over age 50. Eczema is another common skin condition that causes itchiness and well as redness and swelling. Seborrheic dermatitis is a skin condition that causes scaly, itchy, red skin on a person's scalp. An allergic reaction can also cause burning itchy scalps.