Small rashes on a 2-month-old baby are quite common and can be anything from heat rash to milk spots, so it's really hard to say without seeing it properly. I'd suggest bringing your little one to the PD or polyclinic just to be safe, since they can check what it actually is and advise on the best way to treat it. In the meantime, keep the area clean and dry, and avoid anything too heavy or irritating on the skin. Your doctor will be able to give you the right guidance for your baby's specific rash.