Cleaning the lymphatic system, the glands (thyroid, parathyroid, pineal gland, pituetary gland, adrenal gland etc.) and intestines. Getting rid of all the mucus building foods. It's important to treat the cause, not the disease.
Check out Dr. Morse.
Also using glasses that filters blue light. Putting on some orange filter glasses 2 hours before heading to bed, avoiding screens and white light before sleep. Sungazing is amazing.