Same-Day Cyst Surgery in Tokyo: Who Qualifies, What to Expect and Aftercare

Introduction

“I can’t take several days off work—can you remove the lump on the same day you examine it?” This is a question we often receive from foreigners working in Tokyo. For epidermoid cysts (atheroma), one of the most common types of skin lumps, same-day outpatient surgery may be possible if the examining physician determines that there are no concerns and appointment slots are available.

However, same-day surgery is not possible in every case. This article uses IC Clinic Tokyo (a 3–5 minute walk from Tokyo Station’s Yaesu Exit) as an example to explain the conditions required for same-day surgery, what to expect on the day, estimated costs, and post-operative care. For general information about epidermoid cysts—including causes, how to identify them, and surgical techniques—please see our treatment page.

Conditions Required for Same-Day Surgery

Whether same-day surgery is possible will be determined by the physician at the time of your consultation, based on the following factors.

• Diagnosis: The cyst must be identifiable as an epidermoid cyst through physical examination and any necessary tests (such as ultrasound). If a lipoma is suspected, an MRI scan will be required first, and surgery will be scheduled for a separate visit.
• Appointment Availability: A surgical slot must be available. Noting “same-day surgery requested” when booking will make scheduling easier.
• Size and Location: Small cysts of a few millimeters can often be removed in a short procedure immediately after consultation. Larger cysts or those near joints may require scheduling surgery on a separate day.
• Presence of Inflammation: Even an inflamed epidermoid cyst—one that is red, swollen, and painful—may require treatment on the same day (see the section below). However, if inflammation has spread over a wide area, it may be preferable to manage the inflammation and pain on the day of your visit and schedule definitive surgery for another day.
• Current Medications: Patients taking blood-thinning medications (anticoagulants or antiplatelet agents) may not be able to have surgery without first stopping these medications. Since confirmation of whether it is safe to pause them must be obtained from the prescribing healthcare provider, same-day surgery may not be possible. Please be sure to inform us when booking and at reception.
• Minors: Surgery requires the presence of a parent or legal guardian, or a consent form signed and sealed by one.

What to Expect on the Day (at Our Clinic)

1. Booking: Use the English online booking form at https://ic-clinic.com/en/reservation/tokyo/ to select your symptom category and preferred date and time. Please include any notes such as “same-day surgery requested” or “red and swollen” in the comments field.
2. Reception: Insurance eligibility will be verified using your My Number health insurance card or eligibility confirmation document, and your identity will be confirmed using your residence card or passport. You will then complete an English-language medical questionnaire. Our staff can assist using translation apps.
3. Consultation and Examination: The physician will examine the lump and perform an ultrasound if needed. If an epidermoid cyst is diagnosed, the physician will explain the surgical approach (elliptical excision or punch excision), whether same-day surgery is feasible, the estimated cost, and associated risks. You will then be asked to sign an English-language consent form.
4. Surgery: The procedure is performed under local anesthesia. We aim for approximately 5 minutes for small cysts and up to around 20 minutes for larger ones, though this can vary between individuals. The removed tissue will generally be sent for pathological examination to rule out malignancy.
5. Payment: Payments for health insurance-covered treatment are accepted in cash (Japanese yen) only.
6. Going Home: No hospital stay is required; you may go home directly after the procedure. Please avoid alcohol and strenuous exercise on the day of surgery and the following day, as these may increase the risk of bleeding.

If the Cyst Is Red, Swollen, or Has Ruptured

• An inflamed epidermoid cyst may require prompt treatment. Please contact us as soon as possible before the condition worsens.
• If the cyst has ruptured and its contents have discharged, disinfection is not necessary. Gently cleanse the area and cover it with gauze or a similar dressing. Do not attempt to squeeze out the contents.
• If inflammation has spread over a wide area, it may be preferable to first manage the inflammation and discomfort using a procedure similar to punch excision, and then schedule definitive surgery on a separate day once the area has settled—this approach may help reduce the risk of recurrence. The physician will determine the appropriate course of action during your consultation.
• After an infection-related inflammation, the cyst wall can become fragile, making complete removal more difficult and increasing the risk of recurrence. If you notice a lump, we recommend consulting us before inflammation develops.

Estimated Costs (Health Insurance Coverage, 30% Co-payment, Tax Included)

• Diagnosis, testing, surgery, and pathological examination for epidermoid cysts are covered by health insurance. With a 30% co-payment, the total is generally in the range of approximately ¥10,000–¥15,000.
• The exact amount varies depending on whether the cyst is in an exposed or non-exposed area, its size, and its location. Consultation fees, prescription fees, and examination costs are charged separately. For size-based cost estimates, please refer to the fee schedule on our treatment page.
• Your co-payment rate depends on your age and income. Patients not enrolled in Japan’s public health insurance system will be charged the full amount (10 out of 10 points).
• You may be eligible to claim a surgical benefit from your private health insurance. If you require a medical certificate (¥5,500 per copy, tax included; available in English; postal application available), please let us know at the time of your visit.

Post-Operative Care

• Wound Protection: After surgery, the wound will be covered with a transparent film dressing, gauze, or a bandage. As a general guide, bandages may typically be removed after 1–2 weeks once the wound has closed and there is no bleeding. As this varies between individuals, please confirm with your physician at your consultation.
• Bathing: Please avoid bathing on the day of surgery due to the risk of bleeding. From the following day onward, you may shower and gently wash the wound with soap. Please avoid soaking in a bathtub or using a swimming pool for approximately one week.
• Exercise and Alcohol: Please avoid alcohol and strenuous exercise on the day of surgery and the day after. Beyond that, you may generally resume your normal routine as directed by your physician. Cysts near joints may require a longer period of rest.
• Suture Removal: If sutures were used, removal is typically performed around two weeks after surgery. The timing varies depending on your treatment plan, and the recommended date will be communicated by your surgeon at the time of the procedure. In some cases, suture removal is not required with the punch excision technique.
• Wound Healing: As a general example for punch excision, wound oozing typically subsides within 3–5 days. The wound gradually closes over approximately two weeks following surgery, and full healing continues over the following months.
• For Facial Surgery: As a general rule, makeup may be applied around the wound on the day of surgery (this may vary depending on the post-operative condition).
• Symptoms That Require You to Contact Us: Persistent wound pain, fever, swelling that does not subside, persistent warmth around the wound, or discharge from the wound may be signs of infection. Please contact us promptly. For further details, please refer to our related article.

FAQ

Q1. Is surgery guaranteed on my first visit?

A. It is not guaranteed. Same-day surgery is possible when the physician confirms a diagnosis of epidermoid cyst, determines there are no contraindications, and a surgical slot is available. Patients taking blood-thinning medications or those suspected of having a lipoma will not be eligible for same-day surgery.

Q2. Will the surgery be painful?

A. The procedure is performed under local anesthesia. While the level of discomfort varies between individuals, we use very fine needles and other techniques aimed at minimizing pain. Some mild discomfort may persist for a few days after the procedure.

Q3. Can I go to work the day after surgery?

A. In most cases, you can return to your usual routine the following day, provided the surgical site is kept at rest. However, please avoid alcohol and strenuous exercise on the day of surgery and the day after, and your physician may recommend additional rest depending on the location and size of the cyst.

Supervising physician: Kota Takakuwa, M.D., IC Clinic Tokyo