Hi...dear user..,
Thanks for choosing HCM..,
Red jelly bean shaped bumps on chest ...,
Without pain and itching...could be 
KELOIDS...,
It is 
hypertrophic Scar....,due to pinching or scratching of the pimple like lesion..,
Chest , shoulder and arms are more prone areas...,
So good treatmnet is available....,
1) Intralesional 
steroid injections....weekly once for 6 weeks...,
2) Topical...scar removal creams....BIO-CORNEUM...Wockardt..,
3) Tab...derantox ...skin 
vitamins for 30 days..,
4) Cosmetic surgery.....by skilled good plastic surgeon...,
thanQ