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Pigmentation

Pigmentation

The color of the skin is influenced by a number of pigments, including melanin, carotene, and hemoglobin. Recall that melanin is produced by cells called melanocytes, which are found scattered throughout the stratum basale of the epidermis. The melanin is transferred to the keratinocytes via melanosomes.
Melanin occurs in two primary forms: eumelanin that provides black and brown pigment and pheomelanin that provides red color. Dark-skinned individuals produce more melanin than those with pale...

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Related Experiment Video

Updated: Oct 26, 2025

Quantifying Abdominal Pigmentation in Drosophila melanogaster

Quantifying Abdominal Pigmentation in Drosophila melanogaster

Published on: June 1, 2017

"Transient pseudo-lentigines sign" in burrowing bug pigmentation.

Ashish Amrani¹, Abheek Sil², Anupam Das³

¹Department of Dermatology, Venereology, and Leprosy, NC Medical College, Panipat, India.

Pediatric Dermatology

|August 2, 2021

Summary

Burrowing bugs (Cydnidae) can cause temporary skin darkening, a condition often overlooked. Researchers propose "transient pseudo-lentigines sign" for this fleeting, arthropod-induced hyperpigmentation.

Area of Science:

Dermatology
Entomology
Toxicology

Background:

Cutaneous pigmentation from arthropod bites is an emerging dermatological concern.

Keywords:

Cydnidae burrowing bug dermoscopy pseudo-lentigines sign

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The family Cydnidae, commonly known as burrowing bugs, are increasingly implicated.

The transient nature of this pigmentation may lead to underreporting in medical literature.