Purple gums is a sign of Gingivitis, a form of periodontal disease where there is prolonged plaque buildup. It can have several causes, including poor oral hygiene, smoking, aging, hormonal imbalance and pregnancy.
This is a sign of poor circulation. It could be due cold, illness, low blood pressure or shock. Keep an eye on your friend and call a doctor just be on the safe side. If they develop any other concerning symptoms you might consider taking them emergency room or calling 911.
It could be a symptom of gingivitis, which is an inflamation of the gums.The best way to prevent it is to practice oral hygene that consist of daily brushing and flossing three times a day. An oral rinse will also help mantain healthy gums.