Types of Moles
Types of Moles
Melanocytic nevus or mole represent a family of skin lesion. Some common variants or types are classified and listed here:
- Based on location of the melanocyte residing:
- Junctional nevus: as the name implies, the nevus cell reside at the junction between the epidermis and dermis, also called dermal epidermal junction. Such lesion is flat and the color is brown to black.
- Intra-dermal nevus: as the name suggest, the nevus cell is located inside the dermis ONLY. Such lesion are raised. The colour is always non pigmented as it is a deep lesion. One only see a raised skin. Therefore, it is just the skin color or flesh colored.
- Compound nevus: as the name suggest, it is a mixture of the above two. The melanocyte reside both in the junctional and the intra-dermal locations. Such lesion is slightly raised. The color is usually brown to black. The so called beauty mole that gives a celebrity the character is normally compound nevus. This may be congenital or acquired mole.
Types of Moles: All Raised Pigmented Moles are Compound Moles.
- Dysplastic nevus: this is usually a compound nevus. There is dysplasia or abnormal melanocyte cell architectural arrangement of the cell. there is a changing of the mole from benign into bad mole. Such mole are flat or raised. They vary in size but typically much larger than usual mole. They have irregular border, shape, and color or surface. Therefore, they tends to resemble melanoma. The risk is much higher than to get skin cancer after transformation of the lesion. Dysplastic nevi are a marker of risk. This is true if there is a numerous atypical mole syndrome. If there are more than 4 moles, the dysplastic nevi has a very much higher chance of turning into a very virulent kind of melanoma or the skin cancer.
- Blue nevus: as the name suggest, such mole is blue in color. The melanocyte cell is located very deep into under the skin, below the dermis. The upper epidermis layer is normal in cell and color.
- Spitz nevus: this is a totally different form of intradermal nevus and occurs usually in the children group. The lesion is raised and the color is reddish, meaning is NOT pigmented.
- Acquired nevus: as the name implies, is acquired in later life versus the congenital mole. The lesion/mole includes the junctional, intradermal and compound nevus/mole.
- Giant pigmented nevus: such lesion is usually very large, pigmented and also hairy congenital mole/nevus. The importance is that melanoma may arise from such lesion. The chance is 10 to 15%.
- Intra-mucosal nevus/mole: this is the junctional mole. It occurs in the mucosa of orifices, the mouth, or genital area. If in the mouth, it is found in the hard palate mucosa.
- Nevus of Ota and nevus of Ito: both of them are flat and brownish. They are congenital. The lesion is found on the face or shoulder.
- Mongolian spot: this is a congenital lesion. The color is bluish. The lesion usually disappear by puberty. It is found in East Asian Mongoloid ethnic group. This is not to say that it is exclusively in found in them.
- Recurrent nevus: any mole/nevus that is incompletely removed, the mole will recur due to residual nevus cell left in the surgical wound and will growing back.
Types of Moles: Classification of Moles