1. Lower segment (bulb and suprabulb) Extends from base of follicle to insertion of erector pili muscle Bulb Suprabulb

2. Melanin Formed in pigment-producing cells (melanocytes) in hair bulb during growing (anagen) phase Melanin granules spread throughout cortex Two forms: 1-Eumelanin (brown and black hair) 2-Pheomelanin (red and blonde hair)

3. Eumelanin: Brown, black Gray Hair: No color Phaeomelanin: Red, Blond Hair Pigmentation

4. Dark Pigmented Red Pigmented

5. Hair Colors

6. Causes of Excessive Hair HirsutismHypertrichosisHyperandrogenism Idiopathic Hirsutism Late onset congenital adrenal hyperplasia Ovarian tumors Adrenal causes Pregnancy: luteoma of pregnancy Drugs

7. Best Scenario Same phase Same depth Dark pigment Light skin

8. Normal Scenario Different phase Different depth Different pigment Differing skin color

9. lip 1-2.5mm Arms Beard Breasts 2-4mm Legs 2-4.5mm Scalp 2-5mm Axilla 4-5mm Chest Back 5-7mm