Hello, I spit out very tiny amounts of blood very rarely. I keep forcing coughs and clearing my throat to see if there are any traces of blood but there aren't any blood everytime I check, it only happens very randomly. My saliva is clear all day and I don't seem to have any issues reguarding my health. No cough, No chest pain, No fever, No Breathlessness, No Vomiting and etc. I do not smoke l, I have never drank beer or wine in my entire life and I am still 20 years old. If my forceful coughing did not bring any traces of blood, where could the blood have come from? (I provided a photo of one of my spits 4 days ago)