Pyogenic granuloma is a rapidly growing, tumor-like lesion that develops as a response to local irritation (e.g., poor hygiene or overhanging restorations) or trauma. Altered hormonal levels in pregnancy increase the incidence and severity of this condition.
Jafarzadeh H, Sanatkhani M, Mohtasham N. Oral Pyogenic granuloma: a review. J Oral Sci. 2006; 48(4) 167-75.