Pimples on the chin and around the mouth are frequently triggered by wrong cosmetics, wrong diet, and dependent on hormonal fluctuations. Start with low percentage medical-grade anti-acne creams such as benzoyl peroxide 2.5%. Check your personal routine on the MDacne app for cosmetics and diet advice. Another tip - fluoride in toothpaste and iodine-containing green algae can causes pimples around the mouth. Look for fluoride-free toothpaste and try to avoid sushi.