Yes, double lip is considered a rare anomaly.
Double lip is a congenital or acquired condition characterized by an extra fold of tissue on the inside of the lip, visible when the mouth is open or smiling. According to Martins et al. (2004), it is indeed a rare anomaly. This condition is also known by other names, such as "macrocheilia" or hamartoma, as noted by Peterson (1972).
Based on research, double lip affects the upper lip more commonly than the lower lip (Martins et al., 2004). While the exact prevalence is not widely documented due to its rarity, it is consistently described as an uncommon finding in medical literature.
Understanding Double Lip: Key Characteristics
- Rarity: It is classified as a rare anomaly.
- Affected Area: More frequently observed in the upper lip.
- Alternative Names: Known as macrocheilia or hamartoma.
- Appearance: An extra fold of mucosal tissue.
This condition can sometimes be associated with other syndromes, such as Ascher syndrome, which includes blepharochalasis (swelling of the eyelids) and non-toxic thyroid enlargement. However, isolated double lip is also reported.
