Hello sanketbond007,
We see you're having some concerns with your photos, and we can help out.
Based on the description of the issue, it sounds like you may be encountering lens flares.
If so, then this is a common occurrence in photography. It may be more noticeable the brighter the source of the light, and the darker the surrounding environment, such as the sun in the frame, or street lamps at night.
This can be limited by ensuring a bright light source is not directly in the camera focus.
If this happens, move the camera slightly to change the position of the light, or shield the lens with your hand.
Take care.