I feel from last 3-4 week simething stuck in my throat when i see in mirror i saw lump in back of mouth.
The lump you're seeing is your right tonsil. You have asymmetric appearing tonsils. If you are having other symptoms like weight loss, uncontrolled, fevers, fatigue, I would talk to your doctor about any family history of lymphoma you might have. If you have any smoking history, talk about that too. Otherwise looks like a totally normal tonsil