Final answer:
Erythroplakia is not a variation of normal; it is a red patch that may indicate dysplasia or malignancy and is typically considered a pathological change, unlike the other conditions listed which are generally benign.
Step-by-step explanation:
The question you've asked pertains to various conditions that can occur in the oral cavity. To address which of the listed items is not a variation of normal, let's look at each one individually:
- Benign migratory glossitis, also known as geographic tongue, is a harmless condition characterized by map-like patterns on the tongue due to areas of atrophy.
- Linea alba is a normal variation seen as a white line along the buccal mucosa at the level where the teeth meet, caused by the pressure or friction of the teeth.
- Erythroplakia is a red patch that may appear in the mouth, and can be an indicator of dysplasia or malignancy. This condition is typically considered a pathological change rather than a normal variation.
- Varicosities under the tongue, also known as sublingual varices, are dilated veins that are common in older adults and are usually a benign condition.
- Tori are benign bone growths that occur in the oral cavity; they are typically slow-growing and considered variations of normal.
Considering the provided options, Erythroplakia is not a variation of normal and requires further investigation to rule out any potential malignancy or pre-malignant conditions.