Seborrheic dermatitis is a severe type of dandruff characterized by an accumulation of greasy or waxy scalp scales mixed with sebum.
There is a medical term for excessive oil which is known as seborrhea, which is a general scalp problem.
The cause of seborrheic dermatitis is the inflammatory reaction to excess Malassezia yeast, which is an organism that normally resides on the skin's surface. This yeast overgrows and the immune system starts over reacting to it which leads to the inflammatory response as the outcome of skin changing.
It is so because this condition mainly affects the scalp, by causing red patches, dryness/stubborn dandruff. Not only this, it also affects the oily areas of our body such as - nose, skin, face, chest, etc.
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