Macule

Papule

Nodule

Vesicle

Intraepithelial vesicle

Subepithelial vesicle

Ulcer

Petechia

Echymosis

Variable degrees of dysplasia & severe dysplasia (carcinoma in situ) of squamous epithelium

In the severe dysplasia (CA in situ) there is full cytological features of malignancy but still the basement

membrane is intact, i.e. there is no invasion

Actinomycosis. Cervicofacial actinomycosis.

Actinomycosis colony (sulfur granule) surrounded by pus.

Primary syphilis (chancre).

Secondary syphilis. Cutaneous macular lesions.

Tertiary syphilis. Palatal fistula resulting from a gumma.

Tuberculosis of the palate.

Tuberculosis of the maxillary alveolar ridge.

Diagram of typical TB granuloma

Caseation

Epithelioid cells

Multinucleated GC

Lymphocytes

fibroblasts

Single hilar granuloma : lung

Granulomas: low power view

Granuloma : low power view

Outer: inflamm. Cells Histiocytes & Giant cells Necrosis :Center

Granuloma

Langhans giant cell