Patients undergoing dental treatment may be exposed to complications such as allergic reactions. Patients with symptoms of stomatitis, burning mouth, etc. are usually experiencing hypersensitivity reactions due to the prosthetic materials after the prosthetic rehabilitation,. Patch testing is a diagnostic test for type IV hypersensitivity reactions. Another infrequent complication release after prosthetic treatment can be dermographism. We presented a case and discuss the significance and principles of management. In the presented case, after the prosthodontic treatment, erytheme itch and pain on the oral mucosa were recorded. The patient was allergy tested by means of patch test on the upper back. No irritantion reaction was observed on testing sites. However, red dermographic line of contact has developed with small islands of edema. She was then tested at the clinic for pressure urticaria, and the test was considered positive.