Junior Dentist

It is a common low grade malignancy that origanates in the pilo sebaseous glands.
It resembles Squamous cell carcinoma, and considered a varient of invasive squamous cell carcinoma.
Synonyms:

Self healing carcinoma
Molluscum pseudocarcinomatosum
Molluscum sabecum
Verrucoma

Differential diagnosis:

Actin keratosis
Molluscum contagiosum
Muir-Torre Syndrome
Squamous cell carcinoma
Verrucous

Etiology:

Exposure to sunlight
Exposure to Pitch, tar.
Trauma
Human Papilloma Virus
Genetic factors
Immunocompramised status

Clinical  Features:

Age: All ages are equally affected.
Sex: M>F
Race: White>Black
Common sites on [...]

It is a type of Benign Tumor of Epithelial Tissue origin.
The Squamous papilloma is associated with Human Papilloma Virus (HPV) types 6, 11. This Tumor is of low virulance i.e it is not contagious.
Differential Diagnosis:

Veruca Vulgaris
Focal Papillary Hyperplasia

Clinical Features:

The Papilloma shows Exophytic growth.
Numerous small finger like projections which result in lesion with a roughened, [...]

The benign tumors are the non harmful or non malignant multiplication of cells, which form a mass and are  considered as tumors.
The benign tumors of Epithelial origin are:

Squamous Papilloma
Squamous Acanthoma
Kerato Acanthoma
Oral Nevi

The tumors of the oral cavity are classified into types based on their origin, the Tumors are classified into 4 types like:
1. Tumors of Epithelial origin.
2. Tumors of Connective tissue origin.
3. Tumors of Muscle Tissue Origin.
4.Tumors of Nerve Tissue Origin.
These Types are again divided into 3 types each based on the stage of the Tumor:
1. [...]

In the developmental disturbances of teeth as you have seen in the classification we have 2 types:

Microdontia
Macrodontia

We are going to discuss in detail about Microdontia here:
Microdontia: It is defined as the size of theeth which is smaller than normal (or) outside the normal range of teeth size.
Microdontia is again divided into 3 types:

True Generalized
Relatively Generalized
Involving [...]