From the picture provided, the lump appears to be on a part of your throat called oropharynx.
The smooth appearance of the lump suggests that this may be a retention cyst (collection of mucous or saliva under the lining of the throat) or growths from deeper structures including tumours from minor salivary glands. I would recommend that you see an ENT Specialist for an assessment and further investigations.
Hope this helps and all the best!
