What is a melanoacanthoma?

Melanoacanthoma is a term that Mishima and Pinkus introduced in 1960 to describe a pigmented, benign proliferation of both keratinocytes and dendritic melanocytes. Prior to this designation, Bloch described a similar lesion in 1927 that he called melanoepithelioma type I.

Is melanoacanthoma melanocytic?

The lesions are usually solitary and common sites are the head, neck, trunk, often on the lip or the eyelid. Some have suggested that it could be a localized phenomenon induced by trauma. Melanoacanthoma is a proliferation of keratinocytes and melanocytes localized to the epidermis.

Is melanoacanthoma cancer?

Cutaneous melanoacanthoma is a benign skin tumor.

What is clonal seborrheic keratosis?

Clonal seborrheic keratosis (CSK) is a variant of SK characterized by nests of “basaloid” cells, which can mimic the nests of “atypical keratinocytes” seen in pagetoid Bowen disease (PBD).

How do you get oral melanoma?


  1. The predilection for occurrence in the palate remains a mystery.
  2. No link has been established with denture wearing, chemical or physical trauma, or tobacco use.
  3. Melanocytic lesions, such as blue nevi, are more common on the palate.
  4. Oral blue nevi are not reported to undergo malignant transformation.

What is an irritated seborrheic keratosis?

An inflamed keratosis is simply a benign skin growth that has become irritated over time. These rough, hard, crusty lesions often itch, bleed, or rub on clothing. They are also referred to as inflamed seborrheic keratoses.

How common is melanoma in mouth?

In a review of the large studies, melanoma of the oral cavity is reported to account for 0.2-8% of melanomas and approximately 1.6% of all malignancies of the head and neck. In some studies, primary lesions of the lip and nasal cavity also are included in the statistics, thereby increasing the incidence.

Why am I getting so many seborrheic keratosis?

It’s not clear what exactly causes seborrheic keratoses. They tend to run in families, so genes may be a cause. Normal skin aging plays a role because the growths are more common with age. Too much sun exposure may also play a role.