Cutaneous dental sinus is an uncommon disorder that is frequently misdiagnosed as an epidermoid cyst, furuncle, or basal cell carcinoma. The sinus most commonly arises from a periapical abscess of a mandibular tooth, which then dissects through the subcutaneous tissue and exits at a cutaneous surface adjacent to the abscess, most commonly the chin or mandibular cheek.
Dental sinuses have been reported to exit at distant locations such as the cheek, neck, nose, inner canthus of the eye, and even chest.
In addition, most patients seek treatment for the persistently draining cutaneous lesion and are unaware of any co-existing dental pathology. As such, a high index of suspicion must be maintained or the diagnosis will be missed.
Physical clues to the diagnosis include that the lesion is often resistant to previous attempts at extirpation. On palpation it can be fixed to the
underlying tissues and dimple with lateral pressure.
Tomado de JAAD
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Two unusual cases of dental (periapical) infection.
Dermatol Online J . 2006 May 30;12(4):15.

Cutaneous sinus tracts of dental origin are often a diagnostic challenge. A delay in correct diagnosis can result in inappropriate treatments. We describe two unusual cases of periapical infection. The first patient presented with a fistulized tumoral mass under the chin present for 1 year. The patient had only one tooth, and that was anatomically unrelated to the tumor. Radiological examination showed a dormant tooth that was infected periapically. The second case was a man who complained of asymmetry and change in his left nasolabial fold of 4-5 week's duration. On examination, the nasolabial folds were asymmetric without any sign of facial palsy. On intraoral examination, there was a severely decayed tooth on the same side. Radiological survey confirmed periapical infection. A few weeks after proper treatment, the nasolabial folds became