Try saying that ten times fast! Actually, start by trying to say Seborrheic Dermatitis once.
Since starting the Battle Against Bald blog almost four months ago, I have made a point of explaining every cause of hair loss I knew of and have since learned about, including: genetics, alopecia, weight loss, Samson syndrome, heart disease, the list goes on. Much to my surprise, there is another hair loss cause on the block. The culprit is a form of eczema called Seborrheic Dermatitis.
In short, Seborrheic Dermatitis is a disease of the skin, much like eczema. However, unlike eczema and traditional dermatitis, which affect the skin's exterior, Seborrheic Dermatitis can cause permanent hair loss. If Seborrheic Dermatitis on the scalp is left unchecked all the hair on the infected area may be lost.
If you think this could be the cause of your hair loss I suggest you go and see a physician.