Have you encountered a pregnant patient with a gum swelling ?
Pyogenic Granulomas can occur in pregnant women due to the hormonal changes or improper brushing habits. These tumours are non- cancerous and can be treated with Dental scaling and maintaining the dental hygiene.
I had a worried patient with this tumour. Reassuring is what they need with proper scaling.
Thankyou for the information.
Absolutely true! Vitamin supplements can also help.
Which is the most common microbiological cause behind this ?
Woah! 
Dental plaque deposits around the gingiva which consists of variety of bacteria like streptococcus mutans, lactobacillus are the microbiological causative agents for this.
During pregnancy, hormonal changes and shifts in bacteria can raise the chances of developing a pyogenic granuloma. However, keeping up with good oral hygiene can help prevent it. Usually, a simple scaling is enough to treat the issue.