Detailed answer

Dark spots, also known as hyperpigmentation, are commonly caused by various factors such as excess sun exposure, hormonal changes, post-inflammatory response, and certain skin conditions. Bacterial infections, on the other hand, usually result in symptoms like redness, swelling, pustules, or ulcers. However, these infections can cause skin discoloration indirectly, if they lead to inflammation or other skin issues that trigger hyperpigmentation. It is important to consult with a dermatologist to accurately diagnose and treat any skin concerns.