Unusual lumps or thickening of the tissues that are often palpable under the skin.
4. Changes in the appearance of the skin
Darkening, yellowing, redness, non-healing wounds or changes in moles.
5. Persistent cough or hoarseness.
If it lasts longer than 3 weeks, it can indicate problems with the lungs, larynx or thyroid gland.
6. Difficulty swallowing
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