Facial Pigmentation
Facial Pigmentation - Related Videos
03:37
Performing Crush Axotomy on the Facial Nerve in a Mouse Model
0 Views •
2025
Source: Olmstead, D. N., et al., Facial Nerve Axotomy in Mice: A Model to Study Motoneuron Response to Injury. J. Vis. Exp. (2015).This video demonstrates the facial nerve crush procedure in a mouse, where blunt dissection through key landmarks exposes the facial nerve trunk at the stylomastoid foramen. Forceps are then used to compress the nerve trunk, inducing axonal damage and disrupting neuronal signal transmission.
08:41
Quantifying Abdominal Pigmentation in Drosophila melanogaster
0 Views •
Cited by 5 •
2017
This work presents a method to quickly and precisely quantify the abdominal pigmentation of Drosophila melanogaster using digital image analysis. This method streamlines the procedures between phenotype acquisition and data analysis and includes specimen mounting, image acquisition, pixel value extraction, and trait measurement.
08:36
Separation of Mouse Embryonic Facial Ectoderm and Mesenchyme
0 Views •
Cited by 23 •
2013
A protocol for separation of embryo facial ectoderm and mesenchyme is described. We use Dispase II to treat whole embryos first, dissect whole facial prominences out, and then separate the facial ectoderm and mesenchyme.
03:34
Inducing a Facial Nerve Injury in a Rat Model
0 Views •
2025
This video demonstrates a surgical protocol on a rat model, detailing steps from anesthesia preparation to facial nerve injury induction. This protocol is useful for studying nerve regeneration and surgical techniques in medical research.
11:03
A Method for Extracting Pigments from Squid Doryteuthis pealeii
0 Views •
Cited by 4 •
2016
A protocol for the extraction of pigments from the nanostructured granules in squid Doryteuthis pealeii chromatophores is presented.
FAQs
Melanocytes produce melanin and transfer it to nearby keratinocytes, which helps determine how color appears across facial skin. Changes can occur at several points: synthesis may increase or decrease, pigment may be distributed unevenly, or removal may change. Examining these mechanisms helps clinicians connect visible patches with underlying skin biology rather than treating color variation as a single process.
Ultraviolet exposure, hormonal signals, inflammation, injury, medications, and genetic factors can each modify melanin production, distribution, or removal. Their effects may occur alone or together, creating different pigmentation patterns and clinical histories. Identifying relevant exposures and preceding events gives clinicians useful context when assessing whether a change reflects an ongoing influence or follows an earlier skin disturbance.
These conditions can produce overlapping changes in facial color, but their patterns, distribution, duration, and associated symptoms may differ. Melasma and post-inflammatory hyperpigmentation therefore should not be interpreted solely from darkness or lightness of a patch. Comparing the clinical pattern with the history and symptoms helps clinicians distinguish possible causes and select a more appropriate management approach.
Inflammation and injury can disrupt the normal balance of melanin production, distribution, or removal. The resulting change may appear after the original event, so the timing and history of skin disturbance are important during evaluation. Recording these details can help clinicians relate a pigmentary change to a preceding process and distinguish it from pigmentation associated with hormonal, medication-related, genetic, or ultraviolet influences.
Assessment focuses on the pattern and distribution of altered color, how long it has been present, and whether associated symptoms occur. Clinicians also consider relevant influences such as ultraviolet exposure, hormonal signals, inflammation, injury, medications, and genetic factors. Combining these observations supports differentiation among melasma, post-inflammatory hyperpigmentation, and other pigmentary disorders.
Management is informed by whether the observed change appears linked to increased or altered melanin production, distribution, or removal, and by the factors associated with it. This evaluation supports sun-protection strategies and targeted treatments rather than a uniform approach. It also allows care to reflect the person’s clinical pattern and contributing influences, supporting more individualized decision-making.
In medicine, pigmentation patterns provide information that can support dermatologic assessment and help distinguish clinically different disorders. In research, the topic offers a way to study melanocyte activity, melanin transfer to keratinocytes, and the effects of environmental, hormonal, inflammatory, medication-related, and genetic influences. These insights contribute to improved understanding of skin biology and individualized care.