World’s First Human Implant of a 3D-Printed Cornea Restores Sight
December 15, 2025
Background
Blue nevus is the term that means the collection of skin lesions which are the growth of melanocytes stem cells forming bluish to black nodules in the head, extremities, or buttocks. Generally, these scars develop as solitary lesions available for distribution over several skin regions or they can be inherited and found to exist at the time of birth. There are two widely known histological subtypes: type I (commonly blue nevus) and type II (cellular blue nevus) nevus.
Epidemiology
Epidemiology varies among the two typical subtypes of the common divisions. Usually a birthmark-like appearance called common blue nevus is observed in young adults, while cellular blue nevus is mainly diagnosed in middle-aged patients and presents a more than two to one frequency in women in comparison to men.
Anatomy
Pathophysiology
The entity of bluish nevus is also unspecified. It is noteworthy that the components of blue nevus may be in fact part of melanocytes of neural crest which migrated as fetus developed. On the contrary, some believe that they develop from stem cells in the dermis layer. With a high concentration of melanocytes coming out from the dermis and lips of numerous melanophages with their dense melanin pigmentation another unique blue color is present. A pigment responsible for the specific blue color is represented by the reflection rather than absorption of shorter wavelengths of light corresponding to blue color by the dermal melanin.
Etiology
The common blue Nevi are usually an acquired feature; however, they can be congenital and associated with syndromes such as LAMB (lentigines, atrial myxomas, and blue Nevi) or NAME (nevi, atrial myxoma, myxoid neurofibromas, and ephelides). One variant, the epithelialoid type, is a main feature of the complex Carney, a multiple endocrine neoplasia distinguished by skin and mucous membrane pigmented spots and cardiac myxomas, a brain tumor of visceral neural tissue.
Genetics
Prognostic Factors
The blue nevus shows a positive prognosis as the injury in and of itself is not malignant. Similarly, though malignancy of the melanoma originating from blue nevus is a very rare phenomenon. Symmetrically retrospective analysis illustrates that BNLM poses a risk of metastasis and is similar prognosis to conventional melanoma and when comparing lesions at the same depth and stage.
Clinical History
In much younger age groups, the blue nevi often manifest as non-threatening pigmented lesions, which are usually solitary and have small dimensions. A patient may even be unaware of them until they are incidentally seen during a routine skin examination. Â It is often a common occurrence in those who have been exposed to the sun or had more time outdoors.
Physical Examination
Location: Blue nevi can be found around the body, but they are most common on the extremities, face, scalp or sacral area.
Number and Distribution: Note that quantity and distribution of symptoms can indicate epidemical outbreaks. Multiple may be a symptom of syndromic conditions.
Size and Shape: Analyse size and shape: small macules in contrast to large papules or plaques.
Color: Mostly blue, dark blue, or violet blue; strong colour differences can happen.
Texture: Assess the texture: usually dense yet slightly chewy and have a smooth or semi-rough surface.
Age group
Associated comorbidity
Associated activity
Acuity of presentation
Differential Diagnoses
Blue nevi have a distinct appearance, but they are often misdiagnosed. One less common variant, the amelanocytic blue nevus, may resemble a dermatofibroma or scar due to the lack of melanin pigment and the presence of spindle cells, collagen, and/or sclerotic stroma in histology. It can also be confused with amelanocytic melanoma. Another variant, the desmoplastic blue nevus, shows exaggerated dermal fibrosis histologically and may be mistaken for desmoplastic melanoma. Additionally, blue nevus-like melanoma must be carefully distinguished from blue nevi, especially the cellular subtype, to avoid delayed diagnosis and treatment, as the two conditions are frequently confused with each other.
Laboratory Studies
Imaging Studies
Procedures
Histologic Findings
Staging
Treatment Paradigm
Observation: Most blue nevi are harmless and thus they don’t require any medical treatment. They may be checked from time to time for changes in size, shape, appearance, or color.
Surgical Excision: A blue nevus showing some characteristic signs, tending to be cosmetically bothersome can be removed through surgical excision under certain scenarios. Removal of the whole lesion and an appropriate margin of surrounding tissue is carried out (to provide adequacy).
Dermoscopic Evaluation: Dermoscopy, a non-invasive technique that optically magnifies the features of the lesion, which is applied to have closer look with the naked eye. This may result in diagnostic differentiation between harmless blue nevi and possibly malignant tumors, aiding in therapeutic decision-making.
Biopsy: The biopsy methods are performed in cases of an ambiguous diagnosis or suspicious features of malignancy to achieve histopathological diagnosis. In this process, a physician aspirates a small bit of the lesion for inspection by a pathologist under the microscope.
Cosmetic Treatments: If the lesion is a blue nevus, primarily, the cosmetic problem on the surface of the skin, laser therapy or cryotherapy will be required to reduce the pigmentation or flatten the lesion overall.
by Stage
by Modality
Chemotherapy
Radiation Therapy
Surgical Interventions
Hormone Therapy
Immunotherapy
Hyperthermia
Photodynamic Therapy
Stem Cell Transplant
Targeted Therapy
Palliative Care
use-of-a-non-pharmacological-approach-for-treating-blue-nevi
Administration of Pharmaceutical Agents with Drugs
Blue nevi are usually harmless lesions that do not typically need medication, so pharmaceutical drugs are not the main treatment option.
use-of-intervention-with-a-procedure-in-treating-blue-nevi
use-of-phases-in-managing-blue-nevi
Medication
Future Trends
References
Blue nevus is the term that means the collection of skin lesions which are the growth of melanocytes stem cells forming bluish to black nodules in the head, extremities, or buttocks. Generally, these scars develop as solitary lesions available for distribution over several skin regions or they can be inherited and found to exist at the time of birth. There are two widely known histological subtypes: type I (commonly blue nevus) and type II (cellular blue nevus) nevus.
Epidemiology varies among the two typical subtypes of the common divisions. Usually a birthmark-like appearance called common blue nevus is observed in young adults, while cellular blue nevus is mainly diagnosed in middle-aged patients and presents a more than two to one frequency in women in comparison to men.
The entity of bluish nevus is also unspecified. It is noteworthy that the components of blue nevus may be in fact part of melanocytes of neural crest which migrated as fetus developed. On the contrary, some believe that they develop from stem cells in the dermis layer. With a high concentration of melanocytes coming out from the dermis and lips of numerous melanophages with their dense melanin pigmentation another unique blue color is present. A pigment responsible for the specific blue color is represented by the reflection rather than absorption of shorter wavelengths of light corresponding to blue color by the dermal melanin.
The common blue Nevi are usually an acquired feature; however, they can be congenital and associated with syndromes such as LAMB (lentigines, atrial myxomas, and blue Nevi) or NAME (nevi, atrial myxoma, myxoid neurofibromas, and ephelides). One variant, the epithelialoid type, is a main feature of the complex Carney, a multiple endocrine neoplasia distinguished by skin and mucous membrane pigmented spots and cardiac myxomas, a brain tumor of visceral neural tissue.
The blue nevus shows a positive prognosis as the injury in and of itself is not malignant. Similarly, though malignancy of the melanoma originating from blue nevus is a very rare phenomenon. Symmetrically retrospective analysis illustrates that BNLM poses a risk of metastasis and is similar prognosis to conventional melanoma and when comparing lesions at the same depth and stage.
In much younger age groups, the blue nevi often manifest as non-threatening pigmented lesions, which are usually solitary and have small dimensions. A patient may even be unaware of them until they are incidentally seen during a routine skin examination. Â It is often a common occurrence in those who have been exposed to the sun or had more time outdoors.
Location: Blue nevi can be found around the body, but they are most common on the extremities, face, scalp or sacral area.
Number and Distribution: Note that quantity and distribution of symptoms can indicate epidemical outbreaks. Multiple may be a symptom of syndromic conditions.
Size and Shape: Analyse size and shape: small macules in contrast to large papules or plaques.
Color: Mostly blue, dark blue, or violet blue; strong colour differences can happen.
Texture: Assess the texture: usually dense yet slightly chewy and have a smooth or semi-rough surface.
Blue nevi have a distinct appearance, but they are often misdiagnosed. One less common variant, the amelanocytic blue nevus, may resemble a dermatofibroma or scar due to the lack of melanin pigment and the presence of spindle cells, collagen, and/or sclerotic stroma in histology. It can also be confused with amelanocytic melanoma. Another variant, the desmoplastic blue nevus, shows exaggerated dermal fibrosis histologically and may be mistaken for desmoplastic melanoma. Additionally, blue nevus-like melanoma must be carefully distinguished from blue nevi, especially the cellular subtype, to avoid delayed diagnosis and treatment, as the two conditions are frequently confused with each other.
Observation: Most blue nevi are harmless and thus they don’t require any medical treatment. They may be checked from time to time for changes in size, shape, appearance, or color.
Surgical Excision: A blue nevus showing some characteristic signs, tending to be cosmetically bothersome can be removed through surgical excision under certain scenarios. Removal of the whole lesion and an appropriate margin of surrounding tissue is carried out (to provide adequacy).
Dermoscopic Evaluation: Dermoscopy, a non-invasive technique that optically magnifies the features of the lesion, which is applied to have closer look with the naked eye. This may result in diagnostic differentiation between harmless blue nevi and possibly malignant tumors, aiding in therapeutic decision-making.
Biopsy: The biopsy methods are performed in cases of an ambiguous diagnosis or suspicious features of malignancy to achieve histopathological diagnosis. In this process, a physician aspirates a small bit of the lesion for inspection by a pathologist under the microscope.
Cosmetic Treatments: If the lesion is a blue nevus, primarily, the cosmetic problem on the surface of the skin, laser therapy or cryotherapy will be required to reduce the pigmentation or flatten the lesion overall.
Dermatology, General
Blue nevi are usually harmless lesions that do not typically need medication, so pharmaceutical drugs are not the main treatment option.
Blue nevus is the term that means the collection of skin lesions which are the growth of melanocytes stem cells forming bluish to black nodules in the head, extremities, or buttocks. Generally, these scars develop as solitary lesions available for distribution over several skin regions or they can be inherited and found to exist at the time of birth. There are two widely known histological subtypes: type I (commonly blue nevus) and type II (cellular blue nevus) nevus.
Epidemiology varies among the two typical subtypes of the common divisions. Usually a birthmark-like appearance called common blue nevus is observed in young adults, while cellular blue nevus is mainly diagnosed in middle-aged patients and presents a more than two to one frequency in women in comparison to men.
The entity of bluish nevus is also unspecified. It is noteworthy that the components of blue nevus may be in fact part of melanocytes of neural crest which migrated as fetus developed. On the contrary, some believe that they develop from stem cells in the dermis layer. With a high concentration of melanocytes coming out from the dermis and lips of numerous melanophages with their dense melanin pigmentation another unique blue color is present. A pigment responsible for the specific blue color is represented by the reflection rather than absorption of shorter wavelengths of light corresponding to blue color by the dermal melanin.
The common blue Nevi are usually an acquired feature; however, they can be congenital and associated with syndromes such as LAMB (lentigines, atrial myxomas, and blue Nevi) or NAME (nevi, atrial myxoma, myxoid neurofibromas, and ephelides). One variant, the epithelialoid type, is a main feature of the complex Carney, a multiple endocrine neoplasia distinguished by skin and mucous membrane pigmented spots and cardiac myxomas, a brain tumor of visceral neural tissue.
The blue nevus shows a positive prognosis as the injury in and of itself is not malignant. Similarly, though malignancy of the melanoma originating from blue nevus is a very rare phenomenon. Symmetrically retrospective analysis illustrates that BNLM poses a risk of metastasis and is similar prognosis to conventional melanoma and when comparing lesions at the same depth and stage.
In much younger age groups, the blue nevi often manifest as non-threatening pigmented lesions, which are usually solitary and have small dimensions. A patient may even be unaware of them until they are incidentally seen during a routine skin examination. Â It is often a common occurrence in those who have been exposed to the sun or had more time outdoors.
Location: Blue nevi can be found around the body, but they are most common on the extremities, face, scalp or sacral area.
Number and Distribution: Note that quantity and distribution of symptoms can indicate epidemical outbreaks. Multiple may be a symptom of syndromic conditions.
Size and Shape: Analyse size and shape: small macules in contrast to large papules or plaques.
Color: Mostly blue, dark blue, or violet blue; strong colour differences can happen.
Texture: Assess the texture: usually dense yet slightly chewy and have a smooth or semi-rough surface.
Blue nevi have a distinct appearance, but they are often misdiagnosed. One less common variant, the amelanocytic blue nevus, may resemble a dermatofibroma or scar due to the lack of melanin pigment and the presence of spindle cells, collagen, and/or sclerotic stroma in histology. It can also be confused with amelanocytic melanoma. Another variant, the desmoplastic blue nevus, shows exaggerated dermal fibrosis histologically and may be mistaken for desmoplastic melanoma. Additionally, blue nevus-like melanoma must be carefully distinguished from blue nevi, especially the cellular subtype, to avoid delayed diagnosis and treatment, as the two conditions are frequently confused with each other.
Observation: Most blue nevi are harmless and thus they don’t require any medical treatment. They may be checked from time to time for changes in size, shape, appearance, or color.
Surgical Excision: A blue nevus showing some characteristic signs, tending to be cosmetically bothersome can be removed through surgical excision under certain scenarios. Removal of the whole lesion and an appropriate margin of surrounding tissue is carried out (to provide adequacy).
Dermoscopic Evaluation: Dermoscopy, a non-invasive technique that optically magnifies the features of the lesion, which is applied to have closer look with the naked eye. This may result in diagnostic differentiation between harmless blue nevi and possibly malignant tumors, aiding in therapeutic decision-making.
Biopsy: The biopsy methods are performed in cases of an ambiguous diagnosis or suspicious features of malignancy to achieve histopathological diagnosis. In this process, a physician aspirates a small bit of the lesion for inspection by a pathologist under the microscope.
Cosmetic Treatments: If the lesion is a blue nevus, primarily, the cosmetic problem on the surface of the skin, laser therapy or cryotherapy will be required to reduce the pigmentation or flatten the lesion overall.
Dermatology, General
Blue nevi are usually harmless lesions that do not typically need medication, so pharmaceutical drugs are not the main treatment option.

Both our subscription plans include Free CME/CPD AMA PRA Category 1 credits.

On course completion, you will receive a full-sized presentation quality digital certificate.
A dynamic medical simulation platform designed to train healthcare professionals and students to effectively run code situations through an immersive hands-on experience in a live, interactive 3D environment.

When you have your licenses, certificates and CMEs in one place, it's easier to track your career growth. You can easily share these with hospitals as well, using your medtigo app.
