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Human Skin Color and Hyperpigmentation

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Questions and Answers

What is the principal determinant of skin color?

Carotenoids

Reduced hemoglobin

Melanin pigment (correct)

Oxyhemoglobin

What is the most common cause of facial melanosis?

Haemochromatosis

Addison disease

Melasma (correct)

Metastatic melanoma

What is the name of the condition that results in a yellow-orange hue of the skin due to ingestion of colored fruit and vegetables?

Carotenoderma (correct)

Hyperpigmentation

Hypopigmentation

Melanosis

What is the name of the hormone that may cause generalized hyperpigmentation when present in excessive amounts?

Melanocyte-stimulating hormone (MSH) Signup and view all the answers

What is the term for the excessive deposition of melanin in the skin?

Hyperpigmentation Signup and view all the answers

What is the most common site of hypermelanosis in melasma?

Upper lip, malar regions, forehead, and chin Signup and view all the answers

What is the speculated reason for increased skin pigmentation in pregnancy and oral contraceptive users?

Increased levels of oestrogen and progesterone stimulating melanocyte activity Signup and view all the answers

What is the purpose of using Wood's lamp examination in melasma?

To determine the type of melasma (epidermal, dermal, or mixed) Signup and view all the answers

What is the typical appearance of dermal melasma?

Grey or bluish Signup and view all the answers

What is the first line of treatment for melasma?

Sun protection and changing oral contraceptive to an alternative low-oestrogen preparation Signup and view all the answers