Have lump in my throat behind uvula, flesh color slightly reddish, painless, for about 5 weeks now, no hoarseness or trouble swallowing. is it cancer?

See Doc for Exam: You should be looking at the right tonsil or palantine fold. If it is different from the left side and you have symptoms, hoarsness and cough, then you should have it examined by a physician for a proper diagnosis.

Possibly: A number of lesions can develop behind the uvula which is the tag of flesh hanging down from the posterior soft palate. The lesions there can represent a minor salivary gland tumor in the posterior oropharynx, lymphoid tissue that has hypertrophied or even a squamous cell lesion. If it does not disappear it should then be biopsied. To resect if necessary requires transhyoid pharyngotomy.