Chin whelk is a term used to describe a type of acne that appears on the chin and jawline. While it is commonly known as a chin whelk, there are a variety of other synonyms that can be used to describe this type of acne. Some of the most common synonyms include nodular acne, cystic acne, and papular acne. These terms are all used to describe the size and shape of the acne, which is typically larger and deeper than other types of acne. Other synonyms for chin whelk include pimples, zits, and blemishes. Regardless of the terminology used, it is important to treat chin whelk properly in order to prevent scarring and further breakouts.