Do you know what could be causing your itchy scalp?
Allison Tsai | Jan 8, 2013
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An overproduction of skin oil and irritation from the yeast malassezia causes an itchy scalp condition called dandruff.
Actually, this is the cause of seborrheic dermatitis, which can occur on various parts of the body, including the scalp, eyebrows, eyelids, behind the ears and on the chest. It can also cause dandruff, which are white flakes of dry skin, or yellowish skin scales. Source: [NIH](http://www.nlm.nih.gov/medlineplus/ency/article/000963.htm)
Washing your hair too much or too little can cause an itchy scalp.
If you wash your hair too much, you strip the scalp of oil that keeps your scalp from becoming too dry. If don’t wash your hair enough, dead skin and oil build-up can also cause itching.
Thick patches of red skin and silvery scales on the scalp are caused by head lice.
This is caused by psoriasis, which is an autoimmune disease that disrupts the cell turnover process. It causes skin cells to rise to the surface too quickly, causing irritation and the characteristic red skin, and scales. Source: [NIH](http://www.nlm.nih.gov/medlineplus/psoriasis.html)
Insects that live on people’s heads and feed on blood are called lice.
The itching from lice is caused when the parasitic insect bites the scalp. This causes an allergic reaction, including redness and itching. The best way to get rid of lice is to treat with medicine that kills it.
Tinea capitis is the name of a fungal infection of the scalp, also known as ringworm.
Ringworm thrives in warm, moist areas, and is contagious if you come in direct contact with the affected area. Minor skin and scalp injuries, poor hygiene and sweating can increase your risk of getting scalp ringworm. Source: [NIH](http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0001881/)