During the period of nipple feeding, infants have certain temporary anatomic configurations of the cheeks and lips that appear to be aids in sucking. One textbook on pediatrics1 makes mention of a fullness of the cheeks on both the buccal mucous and the skin surface that is produced by excess of adipose tissue. The term sucking pads has been applied to these accumulations of fat. Another structure well-known to pediatricians1-3 is a whitish tumefaction in the center of the upper lip which is called the labial tubercle (see Figures). To one who is not familiar with this formation, it may, when well developed, appear to be a blister and may, on this account, cause alarm that a burn or some other trauma had recently been suffered. Perhaps a queer cheilitis or even a lymphangioma might be considered by some in a differential diagnosis of
DANNENBERG M, LEIDER M, BASS RR. The Appearance of Lips of Suckling Infants. AMA Arch Derm. 1958;78(3):339–340. doi:10.1001/archderm.1958.01560090053012
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