👉 Accessible pimples, also known as open comedones, are the earliest stage of acne formation. They occur when a hair follicle becomes clogged with a mixture of sebum (oil), dead skin cells, and bacteria. This blockage creates a small, visible bump on the skin's surface that can be red and inflamed if it becomes infected. Unlike closed comedones, which remain beneath the skin's surface, accessible pimples are easily visible and can be treated more effectively with topical or oral medications, as they are more susceptible to bacterial invasion and inflammation.