Hi,
Yes, there are several types of treatments that can help with acne scars at your trunk - chest, back, shoulders.
For depressed acne scars, you can consider INFINI, Fractional CO2 or Subcision. These treatments are effective if used singly but give best results if used in combination. Fractional CO2 and INFINI work by stimulating new collagen production to remodel acne scars. Subcision helps to free up tethered scars.
These treatments are also similar to treatments for acne scars affecting the face. The difference is that the healing/ recovery times for acne scar treatments at non-face regions are slightly prolonged.
For the best acne scar treatments for your acne scars, you can refer to this Guide to Acne Scar Treatments in Singapore.