Maxillary sinusitis on the right side needs to be combined with the specific condition. Clinically, maxillary sinusitis is classified as acute or chronic, depending on whether the history of maxillary sinusitis exceeds three months. For acute maxillary sinusitis, which is mostly due to bacterial infection secondary to upper respiratory tract infection, broad-spectrum, sensitive antibiotics are usually chosen to control the infection, nasal decongestants are used to promote drainage, and maxillary sinus puncture irrigation is performed when necessary. For chronic maxillary sinusitis, if active conservative treatment is ineffective, especially if mycosis fungoides is highly suspected clinically, functional nasal endoscopic surgery is needed in a timely manner to completely remove the lesion and establish good drainage to prevent serious complications.