obsolete common blue nevus

Characteristics of Obsolete Common Blue Nevus

A common blue nevus, also known as a common blue naevus, was a type of skin lesion that has been documented in medical literature. The characteristics of this condition are described below:

• Definition: A common blue nevus is a type of melanocytic naevus characterized by spindle-shaped or ovoid cells located deep within the dermis.
• Types: There were several types of common blue nevi, including:
  • Common blue nevus
  • Cellular blue nevus
  • Amelanotic blue nevus
  • Combined blue nevus
  • Sclerosing (desmoplastic) blue nevus
  • Epithelioid naevus
  • Subungual blue nevus
• Frequency: Blue nevi were not uncommon, with a higher frequency in females and adults under 40 years old.
• Size and Location: Common blue nevi typically ranged from 0.5-1cm in size and were most commonly found on the head, neck, sacral area, back of hands, and feet.

Note: The term "obsolete" refers to the fact that this information is no longer current or relevant in modern medical practice. The characteristics and types of common blue nevi may have evolved over time, and new information may have become available.

Common Blue Nevus Signs and Symptoms

A common blue nevus, also known as a common blue mole, typically presents with the following characteristics:

• Smooth surface: The lesion is usually flat or dome-shaped with a smooth surface.
• Size: The size can range between 0.5-1cm in diameter.
• Color: The color varies from being blue-gray to blue-black.
• Shape: It often appears as an oval or circular mole.

These characteristics are commonly associated with a common blue nevus, which is a type of benign skin lesion (see [10]). In most cases, it is not accompanied by any significant symptoms or warning signs. However, if you notice any changes in the size, shape, color, or texture of your mole, it's essential to consult a dermatologist for further evaluation.

References:

• A blue nevus is typically characterized by its smooth surface and small size (see [10]).
• The common blue nevus is usually flat or dome-shaped with a smooth surface (see [15]).
• The color of the common blue nevus can vary from being blue-gray to blue-black (see [15]).

Diagnostic Tests for Common Blue Nevus

The diagnostic tests for common blue nevus have evolved over time, and some methods are now considered obsolete. Here's a summary of the relevant information:

• Imaging studies: In the past, imaging studies were not necessary to diagnose common blue nevus. However, with advancements in technology, dermoscopy has become a useful method for separating common blue nevi from melanoma [5].
• Dermoscopy: Dermoscopy is a non-invasive diagnostic method that uses a dermatoscope to examine the skin lesion. It can help differentiate between common blue nevus and other conditions, such as melanoma [8]. However, in some cases, even dermoscopy may be insufficient, and biopsy may be required [6].
• Biopsy: A biopsy is sometimes necessary to confirm the diagnosis of common blue nevus, especially if there are concerns about malignancy. Fluorescence in situ hybridisation (FISH) assay may also be used in some cases to diagnose melanoma [6].
• Other tests: No other standard laboratory, radiographic, or other tests are commonly used to establish the diagnosis of common blue nevus [7].

It's essential to note that these diagnostic methods have evolved over time, and current practices may differ from those mentioned above. If you're concerned about a skin lesion, it's best to consult with a dermatologist for an accurate diagnosis and treatment plan.

References:

[5] Aug 27, 2024 — Imaging studies generally are not necessary; however, dermoscopy is a useful method for separating common blue nevi from a melanoma. [6] Occasionally even dermoscopy is insufficient and biopsy may be required. Fluorescence in situ hybridisation (FISH) assay is sometimes needed to diagnose ... [7] Oct 31, 2022 —

The differential diagnosis for an obsolete common blue nevus involves considering various conditions that may present similarly to this benign melanocytic lesion.

• Malignant Melanoma: This is a primary concern in the differential diagnosis of blue nevi, as they can be mistaken for malignant lesions. However, malignant melanomas tend to have irregular borders, varied colors, and ulceration [1][2].
• Pigmented Dermatofibroma: This condition presents with a similar appearance to blue nevi but is typically smaller and more superficial [3].
• Metastasis: In rare cases, metastatic lesions can mimic the appearance of blue nevi, particularly if they are located in the dermis [4].
• Thrombosed Plantar Wart: This condition can present with a similar blue-black coloration to blue nevi but is typically more superficial and has a characteristic "doughnut" shape [5].
• Tattooing Effect: In some cases, tattoo ink can be mistaken for a blue nevus, particularly if the tattoo is located in an area where melanocytes are present [6].

It's essential to note that the differential diagnosis of blue nevi can be challenging, and