I have noticed a dark red spot on my earwax yellow-marroon from right ear.left earwax.has normal colour.

Ear Wax Color: Ear wax can look pretty red sometimes. I am wondering if you are talking about blood in the wax, though. It sounds like that is your concern. Avoid using cotton swabs to clean your ears since that can damage the external ear canal or the ear drum. If you ears are itchy, see a doctor for evaluation and treatment since that is most often due to fungus. What you describe sounds okay to me.

Red spot: the red spot with your ear wax may be blood from you trying to get out your wax. Generally you should avoid trying to use q tips or other things to get out the wax yourself. Let your doctor do it for you. The ear canal's skin is thin and easily irritated and you risk puncturing your ear drum if you stick items in your ear canal