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3. Seborrheic Dermatitis (More Severe Form)
What It Is
A chronic inflammatory skin condition that affects oily areas of the body, including the scalp.
Symptoms
- Red, inflamed patches
- Greasy yellow scales
- Persistent itching
- Can extend to eyebrows, ears, and nose
Dermatologist Insight
This condition often comes and goes and may worsen with stress, illness, or seasonal changes.
4. Allergic Contact Dermatitis (Product Reactions)
What It Is
An allergic reaction to something applied to the scalp.
Common Triggers
- Hair dyes (especially PPD)
- Shampoos and conditioners
- Fragrances
- Preservatives
- Styling products
Symptoms
- Sudden intense itching
- Redness or swelling
- Burning or stinging
- Rash that may spread beyond the scalp
Dermatologist Insight
Symptoms can appear hours or even days after exposure, making the trigger hard to identify.
5. Irritant Contact Dermatitis
What It Is
Unlike allergies, this is caused by skin irritation, not an immune response.
Triggers
- Overuse of shampoos
- Harsh sulfates
- Alcohol-based products
- Frequent heat styling
Symptoms
- Itching
- Dryness
- Burning sensation
- No true rash
6. Psoriasis of the Scalp
What It Is
A chronic autoimmune condition that speeds up skin cell turnover.
Symptoms
- Thick, silvery-white scales
- Well-defined red patches
- Intense itching
- May extend beyond hairline
Dermatologist Insight
Scalp psoriasis often appears alongside psoriasis elsewhere on the body, such as elbows or knees.
7. Fungal Infections (Tinea Capitis)
What It Is
A contagious fungal infection, more common in children but possible in adults.
Symptoms
- Patchy hair loss
- Scaling
- Redness
- Itching
- Sometimes pain
Dermatologist Insight
This condition requires prescription treatment and does not resolve on its own.
8. Lice Infestation
What It Is
Head lice are tiny parasites that feed on blood from the scalp.
Symptoms
- Intense itching
- Tickling sensation
- Visible nits (eggs) near hair roots
- Scalp irritation
Dermatologist Insight
Itching may take weeks to develop after infestation.
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