Exulcerate is a rather uncommon word, meaning to form an ulcer or become ulcerated. However, there are several synonyms which can be used to substitute for this word, depending on the context of its usage. One option is the term "ulcerate," which is the more common term and can be used to describe the same condition. Other possible synonyms include: inflame, aggravate, irritate, and worsen. These words can be used to describe a variety of situations, from physical wounds to emotional pain. Ultimately, the choice of synonym depends on the context and the desired tone of the writing or speaking.