Skin colour and its reaction to light melanocyte and their role in colouring the skin
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Skin Colour and its reaction to light Melanocyte and their role in colouring the skin . Skin Biology Lesson 4 . By the end of the lesson the learner should be able to . Human Colour Pigments . 4 m a i n pigments Carotenoids Deoxygenated haemoglobin Oxygenated haemoglobin

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Skin Colour and its reaction to light Melanocyte and their role in colouring the skin

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Skin Colour and its reaction to lightMelanocyte and their role in colouring the skin

Skin Biology Lesson 4


By the end of the lesson the learner should be able to


Human Colour Pigments

4 mainpigments

  • Carotenoids

  • Deoxygenated haemoglobin

  • Oxygenated haemoglobin

  • Melanin ( melas – black)


Formation of melanin


Dendrites and their journey

  • Dendrites have tiny pods like threads called melanosomes ( tiny organelle – organs )

  • Membrane bound in pods contain melanin

  • Vary in size depending on race

  • Comprise 5-10% total cell in basal layer

  • Transfer melanin to the Keratinocytes


Starting of the Journey


Continuing the Journey

  • Melanin is colourless when formed – once matured moves along the dendrites

  • Occurs in the stratum spinosum moves through to neighbouring Keratinocytes

  • Triggered under the influence of the sun - UV light

  • Hovers over nucleus

  • Journeys + flakes off


Completing the Melanocytes journey


MELANIN chemical composition

Tyrosine(amino acid)

Tyronaise (enzyme)

L dopaDopa quinine converts to Eumelanin

Brown / Black Pigment

Cysteine converts to Pheomelanin

Red and Yellow Pigment


Skin colour is due to

  • Not the quantity but the level of activity and size

  • Genetically coded


recorded response time to sunlight

Fitzpatrick system Developed by Professor Thomas Fiztpatrick

Skin types which

Type 1 - always burn never tan

Type 2 - Usually burns but will

tan with difficulty

Type 3 -sometime burn but

will tan

Type 4 - rarely burns

Type 5 - almost never burns


Calculations of burn times

SPF factors

How long can you stay in the

sun without burning?

Sun protection factors

15+

30+

SPF rating x by 15

Spf2 x15 = 30 mins

Spf15 x 15 = 225mins (3 hrs 45mins)

Spf30 x 15 = 450 mins (7hrs 30 mins)


Long term effects of sun exposure


Skin cancers


Skins reaction to light

  • Primary response

  • Is to go red and burn

  • Secondary response

  • Occurs after a few days

  • Resulting in a tan


Level of coverage

Body responses

Depending on time and amount of sun exposure

UVB –epidermis

UVC - dermis


SUNBURN


sunburn


Relevance to beauty therapy treatments


ABCD’s of skin cancer


Disorders of the melanocyte

  • Melasma- also known as chloasmaHyper pigmentation

  • Caused by Pregnancy,

  • contraceptive pill,

  • certain drugs & stress.

  • Exposure to the sun will

  • increase melanisation

  • Once activated very

  • difficult to remove

  • Laser treatments have

  • shown good results

Vitiligo –

Hypo pigmentation.

  • The affected skin shows no melanocytes.

  • No treatment, only cosmetics

  • Michael Jackson is said to have this

  • Affect all races, genetically predisposition


Medication / cosmetics /services which can cause photosensitivity

Drugs

  • Antibiotic

  • Antidepressants

  • Anti malarials

  • Anti arthritic drugs

  • Cortisone

    Beauty Services

  • Peels

  • Waxing

  • Body scrubs

  • Aromatherapy massage oils

Cosmetics

  • Perfumes

  • Aromatherapy oils

  • Fruit acids

  • Vitamin A –retin A

  • Acne medication-

  • Roaccutane


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