What are these small bump on my neck and chest? (photos)

Thank you for your question and photographs. It's difficult to evaluate your skin lesions through photographs. Small bumps on the neck can be a variety of skin lesions such as skin tags, seborrheic keratosis, etc. I highly recommend you consult with a board certified dermatologist to have your skin evaluated and to discuss appropriate treatment options based on what the skin lesions are. Take care and good luck.