A patient's record indicates a skin condition in which depigmentation appears on different parts of the body that are often exposed to sunlight. A skin biopsy reveals a lack of melanocytes. Which condition does this describe?
Keratosis pilaris
Vitiligo
Rosacea
Psoriasis
The Correct Answer is B
A. Keratosis pilaris:
This is a condition of small, rough bumps typically on arms or thighs, not depigmentation.
B. Vitiligo:
Vitiligo is a condition where melanocytes are destroyed, leading to depigmented patches of skin, especially in sun-exposed areas.
C. Rosacea:
Rosacea is characterized by facial redness, flushing, and visible blood vessels, not loss of pigment.
D. Psoriasis:
Psoriasis involves scaly, red plaques due to rapid skin cell turnover, not loss of melanocytes.
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Related Questions
Correct Answer is B
Explanation
A. Keratosis pilaris:
This is a condition of small, rough bumps typically on arms or thighs, not depigmentation.
B. Vitiligo:
Vitiligo is a condition where melanocytes are destroyed, leading to depigmented patches of skin, especially in sun-exposed areas.
C. Rosacea:
Rosacea is characterized by facial redness, flushing, and visible blood vessels, not loss of pigment.
D. Psoriasis:
Psoriasis involves scaly, red plaques due to rapid skin cell turnover, not loss of melanocytes.
Correct Answer is A
Explanation
A. Having greater than 50 moles and green or blue eyes:
Risk factors for melanoma include having many moles, fair skin, light-colored eyes, and history of sunburns.
B. Intermittent claudication and diabetes:
These are vascular and metabolic problems, not related to melanoma risk.
C. Black or brown hair and darker pigmented skin:
Darker skin provides some natural protection against UV radiation, reducing melanoma risk (although melanoma can still occur).
D. Younger than 18 years of age and obesity:
Age under 18 and obesity are not primary risk factors for melanoma. Cumulative sun exposure and genetic predisposition are much more relevant.
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