What Causes Sudden Appearance Of Lots Of Moles?
See a dermatologist for your peace of mind.
Detailed Answer:
As far as I can see from the picture you attached, these freckles/moles don't look concerning. However, seeing them in a picture is never as good as seeing them in person and being able to palpate them and look at each up close.
But I think you should go see a dermatologist and have a good, thorough skin survey. My reason for saying this is because it is unusual to get many new moles in adulthood.
Sometimes we use an "ABCD" mnemonic for the features of moles that are concerning:
Asymmetry - the mole is not round and even.
Irregular Borders - the edges are not well defined.
Color is not regular - may have multiple colors within the same mole.
Diameter - usually larger than a pencil eraser.
Evolving - getting smaller or larger, changing color, itching or bleeding, becoming raised.
It doesn't look like yours are concerning for the ABCD signs, but they are new and you are 33 which is not a typical age to get them in non-sun exposed areas, so go get them checked in person and you'll have better peace of mind. If you see any of them changing or growing - get in to see your doctor quickly. Otherwise I think you have time to wait to see a dermatologist.
I hope this information is helpful. Please let me know if I can clarify further.