blood blister in mouth

I would like to know about a red blister in my mouth that looks like is full of blood and i did not felt any pain but it did leave a dot mark

[Dr Santos]

Hi,

How are you? Blood blisters are a type of blister that is filled with blood caused by a rupture of the blood vessels underneath the skin’s surface. This rupture is usually caused by some form of trauma, such as biting. For the most part, blood blisters do not require special medical attention. Blood blisters that are severe or that reappear, however, may require medical treatment. Try to avoid popping the blister to prevent infection.  Gargling with mouth antiseptic may also help.

Take care and keep us posted.

[Nayder]

i dont know what it is , i just realised i had it after work :/ , i have no clue how i got it or what its from ? can you please tell me