Part 10, Chapter 110: Dermatoses of the Oral Cavity and Lips
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Lateral pterygoid (lower head): by placing a little finger up behind the maxillary tuberosity (the ‘pterygoid sign’)
Rook's Textbook of Dermatology is the most comprehensive work of reference available to the dermatologist. Covering all aspects of skin disease from basic science through pathology and epidemiology to clinical practice, the text is recognized for its unparalleled coverage of diagnosis.