Hi Thank you for asking HCM I have gone through your query. As you having green phlegm which is a sign of bacterial infection, you need antibiotic therapy. It might resolve but you can have complications like ear infection so it is not wise to wait. If you were my patient then I would suggest antibiotics like Co-amoxiclav and decongestants. I also suggest you to take vitamin C , warm fluids like tea with lemon and honey , warm chicken soup with pepper for fast healing. Steam inhalation is also good. Hope this may help you. Let me know if anything not clear. Thanks.