Central callus is a common term used in medical jargon to refer to a thick, hardened area on the skin typically caused by repetitive pressure or friction. Although the term "central callus" is widely recognized, there are several synonyms that can be used interchangeably to describe this condition. These include pressure point, callus formation, focal keratosis, localized hardened skin, focal hypertrophy, and thickened dermal patch. Regardless of the synonym used, it is important to seek medical advice if the central callus becomes painful, inflamed, or starts to interfere with daily activities, as it may require treatment to prevent further complications.