1. OKC
2. CGCG
3. ameloblastoma 

1. Dentigerous cyst
2. Adenomatoid odontogenic tumor
3. OKC
4. Ameloblastoma 

1. Pindborg tumor
2. Calcifying odontogenic cyst
3. Ameloblastic fibro-odontoma
4. Complex odontoma (blocking impacted tooth) 

1. Hemangioma
2. Melanocytic nevus
3. Malignant melanoma 

1. Melanoma
2. Nevi
3. Hemangioma
4. Varicosities 

Tongue -

Erythematous w/ white halo

1. Trauma
2. Geographic tongue
3. Candidiasis 

1. Papilloma
2. Verucca vulgaris
3. Condyloma
4. Giant cell fibroma

1. SCC
2. Trauma
3. Fungal infection
4. TB granuloma
5. Erythema multiforme 

Ulcerated -

floor of the mouth

1. SCC
2. Deep fungal infection
3. TB
4. Primary syphilis
5. Traumatic ulcer 

1. Drug-induced gingival hyperplasia
2. Gingival fibromatosis
3. Leukemic gingivitis
4. Pregnancy gingivitis
5. Plasma cell gingivitis is bright red
6. Scurvy 

Pigmented macule:

Brown/Black

1. Melanotic macule
2. Amalgam tattoo
3. Melanocytic nevus
4. Malignant melanoma

1. Gardner's syndrome
2. Cleidocranial dysplasia
3. Idiopathic supernumery teeth

Swelling -

Submandibular

1. Cat scratch fever
2. Cervical lymphadenopathy
3. Salivary gland tumor

Swelling -

lateral neck

1. Lymphadenopathy
2. Salivary gland tumor
3. Benign lymphoepithelial cyst
4. Cat scratch disease
5. Metastatic cancer

Lower lip @ Vermillion border -

Crusty ulcer

1. SCC
2. Major aphthous ulcer
3. Trauma - burn
4. Herpes
5. Erythema multiforme
6. Impetigo

Extraoral skin lesions -

crusted

1. SCC
2. BCC (basal cell carcinoma)
3. Actinic keratosis

1. Thyroid gland enlargement
2. Thyroglossal duct cyst
3. Dermoid cyst
4. Plunging ranula

1. Candidiasis
2. Pernicious anemia
3. Geo tongue

1. Enamel hypoplasia
2. Enamel hypomaturation
3. Dentinogenesis imperfecta

1. pernicious anemia
2. plummer-vinson syndrome

1. Sialolith
2. BLEC
3. Salivary gland tumor
4. Hemangioma
5. Lymphangioma
6. Dermoid cyst
7. Mucocele