What makes eggs spotted?

[ClaraCluckChicken]

Hi! What makes some eggs have these weird “dots”

 

[nuthatched]

I think those are pores

 

[ClaraCluckChicken]

I think those are pores

So would these eggs just have bigger pores?

 

[nuthatched]

So would these eggs just have bigger pores?

The shells could be thinner so it's more obvious

 

[aart]

Shell could be porous here, candling should tell that tale.

Here's some other reasons.....
'Speckled' eggs can happen for several different reasons...very few, if any, of which are a 'problem'.
Can be caused by:
Excess or uneven pigment coating.
Excess or uneven cuticle(bloom).
Excess calcium deposits.
Porous eggs can appear speckled.
Some birds lay them consistently, some only once in awhile.
The pigment or bloom can change appearance when wet, then change back when dry again.

As long as bird is getting a good diet and is healthy in every other way, it is no cause for concern.