how to fix this problem

I am a beginner with 3d printing. I have creality ender 3 s1. I am posting a photo. Please help!

It appears you have a visible seam, this can be fixed by selecting a random seam.

with random seam it is not a line but still bumps..

Now that we can remove the obvious, it could be determined that one or two other solutions could be tried.

1: you could be experiencing over extrusion you could reduce the flow rate and see if this eliminates bumps.

2: you could have moisture in filament, placing a dollar store Charcoal Moisture Eliminator in your filament storage container could help.
Drying filament could be needed the best way to eliminate moisture is by using a food dehydrator