For as long as i can remember (7+years) when i blow my nose there is often flecks of red blood.chronic allergies and a stuffed nose. likely the cause?

Hopefully no more: Than the result of the chronic allergies constant irritation of the delicate membranes causing little bleeds from surface capillaries. The force of blowing frequently may also play a role - especially if often and hard. You might consider seeing a doctor or allergist for help. There are topical steroid inhalers that can lessen the inflammation and other strategies too. I suffer it too. It stinks.