I've a purple spot (not sure if it's flat), quiet big, smooth, soft and painless, just inside my vagina. I bled during sex recently. What could it be?

Hemangioma? Capillary malformations on the skin can present as hemangiomas (red-purple papules) anywhere on the body. With trauma, they can bleed. Best to have a gyn or dermatologist look at it to be sure it's not something else.