Oral and Genital Ulcers

Ulcers—open sores—in the mouth or genital area can arise for many reasons. This page summarizes likely causes, typical features, how clinicians investigate them, which specialties may be involved, and general guidance on when to seek urgent care. It does not provide personalized medical advice.

Common causes and risk factors

Mouth and genital ulcers have varied origins. Frequent causes include viral infections (for example herpes simplex), aphthous (canker) ulcers, mechanical trauma or friction, sexually transmitted infections, and immune-mediated systemic conditions such as Behçet disease. Some dermatologic disorders, nutritional deficiencies, and certain medications can also cause ulcers. Factors that may trigger repeat episodes include smoking, poor oral hygiene, stress, and repetitive local irritation.

Symptoms and when to seek medical evaluation

Ulcers differ in size, number, pain level and healing time. Seek medical assessment if ulcers are accompanied by high fever, rapidly spreading redness, marked swelling of nearby lymph nodes, difficulty urinating, trouble swallowing or breathing, severe pain, sudden worsening, or ulcers that do not heal as expected. If signs suggest an immediate threat to breathing or consciousness, contact emergency services.

Which specialists may be involved

Initial evaluation can be done by a primary care physician or internal medicine doctor. Depending on the suspected cause, referrals may include Dermatology and Venereal Diseases, Infectious Diseases and Clinical Microbiology, Gynecology, Urology, Ear Nose and Throat, or dental/oral medicine specialists. If a systemic autoimmune condition is suspected, coordinated assessment across specialties may be needed.

How diagnosis is approached

Clinicians gather a history (onset, recurrence pattern, accompanying symptoms, sexual history, medications), perform a targeted exam, and order tests when needed. Laboratory tests or microbiological exams (PCR or cultures), blood tests, and sometimes a tissue biopsy help determine the cause. The goal is to identify the likely reason and guide appropriate specialist referral.

Everyday care and prevention tips

Practical measures include avoiding behaviors that irritate the area, maintaining gentle oral hygiene, limiting exposure to strong chemical irritants, and avoiding sexual contact until a cause is clarified and clinicians advise. Addressing nutritional deficiencies and reducing local trauma may reduce recurrence. These are general measures and do not replace professional assessment for severe or worsening symptoms.

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