The photos do show depressed scars with pigmentation. In general, it is advisable not to squeeze your pimples as there is greater tendency to leave scars if pimples are squeezed. It is also important to ensure that active acne is controlled to prevent new scars from forming.
Topical treatments with retinoids like tretinoin cream may help to lighten the pigmentatation and improve scarring, though the effect on depressed scars is very mild.
There are many different treatment options for acne scars. Chemical peels is a non-invasive treatment that can help reduce the pigmentation, unclog pores, help fine wrinkles and depressed scars, though it is more difficult to address the deep scars with chemical peels.
For deeper depessed scars, a combination of treatments like subcision and fractional laser may be considered. The fractional laser an effective treatment of the depressed scars but a few treatments spaced every 4 to 6 weeks may be needed to optimize the results.
It is best to see your doctor or dermatologist for a proper assessment and discussion of the various treatment options available.