Question:

Why does dandruff make the scalp itch?

Answer:

Typical dandruff doesn't itch. Redness and itching is actually seborrheic dermatitis, which is a common type of eczema. The cause of seborrheic dermatitis is largely unknown, but seasonal changes, stress, and immuno-suppression may be causes.

More Info:

dandruff
Seborrheic dermatitis

Seborrhoeic dermatitis (also seborrheic dermatitis AmE, seborrhea) (also known as "seborrheic eczema") is an inflammatory skin disorder affecting the scalp, face, and torso. Typically, seborrheic dermatitis presents with scaly, flaky, itchy, and red skin. It particularly affects the sebaceous-gland-rich areas of skin. In adolescents and adults, seborrhoeic dermatitis usually presents as scalp scaling similar to dandruff or as mild to marked erythema of the nasolabial fold.

Hairdressing Health
Head and neck

Head and neck anatomy focuses on the structures of the head and neck of the human body, including the brain, bones, muscles, blood vessels, nerves, glands, nose, mouth, teeth, tongue, and throat. It is an area frequently studied in depth by surgeons, dentists, dental technicians, and speech language pathologists.

Dermatitis
Seborrhoeic dermatitis

Seborrhoeic dermatitis (also seborrheic dermatitis AmE, seborrhea) (also known as "seborrheic eczema") is an inflammatory skin disorder affecting the scalp, face, and torso. Typically, seborrheic dermatitis presents with scaly, flaky, itchy, and red skin. It particularly affects the sebaceous-gland-rich areas of skin. In adolescents and adults, seborrhoeic dermatitis usually presents as scalp scaling similar to dandruff or as mild to marked erythema of the nasolabial fold.

Anatomy Eczema Itch
Cradle cap

Cradle cap (infantile or neonatal seborrhoeic dermatitis, also known as crusta lactea, milk crust, honeycomb disease) is a yellowish, patchy, greasy, scaly and crusty skin rash that occurs on the scalp of recently born babies. It is usually not itchy, and does not bother the baby. Cradle cap most commonly begins sometime in the first 3 months. Similar symptoms in older children are more likely to be dandruff than cradle cap. The rash is often prominent around the ear, the eyebrows or the eyelids. It may appear in other locations as well, where it is called seborrhoeic dermatitis rather than cradle cap. Some countries use the term pityriasis capitis for cradle cap. It is extremely common, with about half of all babies affected. Most of them have a mild version of the disorder. Severe cradle cap is rare.


Atopic dermatitis

Atopic dermatitis (AD) also known as atopic eczema is a type of eczema, an inflammatory, relapsing, non-contagious and pruritic (itchy) skin disorder. It has been given names like "prurigo Besnier," "neurodermitis," "endogenous eczema," "flexural eczema," "infantile eczema," and "prurigo diathésique".

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