CLT Skin Conditions & Pathology for Light Therapy

Question 1

Which skin condition is characterized by accelerated keratinocyte proliferation, silver-white plaques, and is commonly treated with narrowband UVB light therapy?

Accepted Answer

Psoriasis

Answer

Rosacea

Answer

Eczema

Answer

Vitiligo

Question 2

What is vitiligo, and which light therapy approach is used to treat it?

Accepted Answer

Loss of melanocytes causing depigmented patches, treated with narrowband UVB or excimer laser

Answer

Excess melanin deposition causing dark spots, treated with IPL

Answer

Chronic inflammation causing redness, treated with red LED light

Answer

Fungal infection causing discoloration, treated with blue light

Question 3

Seasonal Affective Disorder (SAD) is primarily treated with which type of light therapy?

Accepted Answer

Bright white light (10,000 lux) exposure in the morning

Answer

Red LED light applied to the scalp

Answer

Near-infrared panels directed at the chest

Answer

Blue laser therapy to pressure points

Question 4

Which skin type, according to the Fitzpatrick Scale, carries the highest risk of UV-induced hyperpigmentation and requires the most conservative light therapy dosing?

Accepted Answer

Fitzpatrick Types V and VI (brown to dark brown/black skin)

Answer

Fitzpatrick Type I (very fair skin)

Answer

Fitzpatrick Type III (medium skin)

Answer

Fitzpatrick Type II (fair skin)

Question 5

What is actinic keratosis, and why is it significant for a CLT planning light therapy?

Accepted Answer

A pre-cancerous UV-damaged lesion that may contraindicate certain light therapies and requires physician evaluation

Answer

A benign sunspot that is safely treated with high-intensity red light

Answer

A bacterial infection of hair follicles that responds to blue light therapy

Answer

A fungal overgrowth treated with broad-spectrum phototherapy

Question 6

Rosacea subtypes most likely to benefit from light therapy include which of the following?

Accepted Answer

Erythematotelangiectatic rosacea (persistent redness and visible vessels)

Answer

Ocular rosacea affecting the eyelids

Answer

Phymatous rosacea causing skin thickening

Answer

All rosacea subtypes respond equally to all light modalities