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Mohs Information



Mohs Surgery is a highly specialised procedure aimed at total removal of skin cancer while minimizing the amount of normal skin removed in the process. It is most commonly used to treat basal cell carcinoma (BCC) and squamous cell carcinoma (SCC) on the head and neck but is also used in some less common skin cancers and occasionally for more difficult skin cancers elsewhere on the body.
The name Mohs is from the originator of the procedure (Dr Frederic Mohs) who developed this technique in the 1930s.


The steps in Mohs Surgery are:

  1. Removal of the visible portion of the skin cancer and a thin layer of normal-appearing skin around it, using local anaesthesia.
  2. Careful mapping and dyeing of the excised skin and preparation of this tissue for microscopic examination on glass slides.
  3. Examination of these slides under the microscope and marking the exact location of any remaining tumour on the map.
  4. If any residual cancer is detected then the process is repeated, removing a further layer of tissue only at the site of the remaining cancer.

Once the tumour is gone, repair of the resulting defect will then be undertaken – usually on the same day (see page 3 of this Information Sheet).


Mohs surgery differs from standard surgery in having the results immediately available rather waiting for a few days. Also, there is a smaller amount of normal-looking skin tissue around the cancer which is initially taken in step 1.
The 2 great advantages of this technique are:

  1. A higher cure rate. Complete eradication of the skin cancer is usually possible, even in the most difficult and recurrent forms of skin cancer.
  2. Preservation of as much normal tissue as possible while still retaining a high cure rate.


Because this is a highly specialised procedure, it requires personnel trained in the various techniques necessary for success. Your Mohs surgeon has completed a Medical degree, Specialist Dermatology training & then a Fellowship in Mohs Surgery.

  • A/ Prof Shyamala Huilgol undertook her Mohs Fellowship in Vancouver, Canada with Drs’ Alastair Carruthers, Larry Warshawski & David Zloty. Subsequently, she worked at St Thomas’ Hospital in London performing Mohs Surgery.
  • Dr Todd Wiadrowski completed a Fellowship in Mohs Micrographic Surgery in Perth with Drs’ Carl Vinciullo and Tim Elliott. He also gained skills & experience in a wide range of cosmetic and laser treatments during this time.

Other members of the team include nursing assistants experienced in working with skin cancer, a laboratory technician who prepares the tissue for microscopic examination and the office staff.
At present there are only a few centres in Australia with the personnel and training able to offer this treatment.

For more information regarding Mohs surgery visit the following website – www.skincancermohssurgery.org




This consultation allows us the opportunity to examine your skin cancer, obtain your medical history and determine the most suitable way of treating your skin cancer. It also gives you the opportunity to learn about the proposed procedure. Since all skin cancers are not the same, we need to know exactly what type you have before proceeding to definitive treatment. A skin biopsy or small sample of the skin cancer may therefore be required.

The costs associated with your surgery will be discussed with you during this visit. Please note that we are a Registered Day Surgery and if you have Private Hospital Cover there will usually be no charge for the operation or the relevant Theatre Fees (unless you have an excess on your policy).


One of the advantages of Mohs Surgery is that it is performed as an inpatient procedure in our Day Surgery. Occasionally overnight admission to hospital is required – if this is considered necessary, we will discuss this with you at the preoperative visit.


Our staff will call you 24 – 48 hours before the time of your surgery to confirm your appointment. Try to get a good nights rest, eat a good breakfast and take your regular medications (unless otherwise instructed). It is a good idea to wash your hair before the surgery. Please do not wear makeup if the planned surgery is on the face. Wear comfortable clothes which will not have to be pulled over your head after the operation. If your surgery is around the mouth, be prepared to eat soft foods for 2-3 days after the surgery.


Please inform us if you take medications which increase bleeding e.g. Aspirin, Clopidogrel (Plavix, Iscover) or Warfarin as we may need to stop them or reduce dosage prior to surgery. Anti-inflammatory medications e.g. Nurofen increase bleeding, so please stop 3 days before surgery. Please take paracetamol & codeine preparations if you require pain relief in this preoperative period.

Alcohol aggravates bleeding so please avoid alcoholic drinks for 24 hours prior to and after surgery. Smoking reduces blood flow to the skin & slows healing. It would be helpful if you could stop smoking for a minimum of 3 days prior to surgery and for one week afterwards. Please inform us if you are allergic to latex.

The procedure may take several hours, much of which will be spent in the waiting room. It is a good idea to bring a book or magazine with you on the day of surgery. It is recommended that you arrange for someone to drive you home. Company through the day may help you relax (and is a good idea) but please limit this to one or two people because of limited space in our waiting room. A car park permit is available to all surgical patients & this car park is located underneath the ASEC building.

Please complete and return your Patient Admission Form as soon as possible to confirm your admission for day surgery and also to confirm your financial responsibilities prior to your admission.

If you live in the country, we suggest staying in Adelaide for 1-2 days post surgery and we may wish to check your wound before returning home.


As the total procedure may take several hours, appointments are made in the early morning or afternoon. When you arrive for surgery you will be taken to the operating theatre. Our nurse will confirm your name and the procedure, check your medical history and allergies from the form you have filled in, take your pulse and blood pressure and have you remove appropriate clothing.
We will then outline the area to be excised. Your signed consent for the operation will be obtained. Your skin cancer may be photographed – both before and after treatment. These photos become part of your medical record & may be used for teaching purposes. The local anaesthetic will then be administered–you should experience no more than mild discomfort. 5–10 minutes are allowed for the local anaesthetic to work during which time the nurse will apply an earthing pad to your hand and prepare the operation area.
The tissue is then removed and taken to the laboratory. Any bleeding is stopped using electrical diathermy and the nurse will apply a dressing to the wound.
It normally takes between 20 & 30 minutes to anaesthetise the involved area & remove the tissue. It will take approximately one hour to process the tissue & examine it under the microscope. If there are any areas where cancer is still present, the procedure will be repeated. The average number of surgical sessions for successful removal of most cancers is between 1 and 3.
The local anaesthetic contains a very small amount of adrenalin. This reduces bleeding during the operation. Sometimes it will make your heart beat a little faster or make your hands shake for 10–15 mins before settling.


After the skin cancer has been completely removed, we will discuss with you the best method for repairing the wound.
This may involve:

  • Closing the wound with a skin graft or flap.
  • Closing the wound with a straight line of stitches.
  • Letting the wound heal by itself.

Such repairs may be done by us or by other surgical specialists. Each patient is unique and we will work with you to achieve the best possible result.


We will explain exactly how you should care for your wound before you leave and give you an appointment for follow up care and suture removal. Once the wound is repaired, you will feel some tightness in the area for the first 24 or 48 hours. You are likely to have some bruising and swelling – how much you experience may vary according to the area. It is most marked when surgery is done near or above the eyes and is usually worst two days after the surgery. Most of the swelling resolves by one week.

Restriction of physical activity until sutures are removed, but especially in the first 24 – 48 hours post-op is advised.
Skin cancer surgery frequently damages nerves and you may experience a sensation of numbness around the wound. This will usually return slowly to normal over a period of 6 to 12 months, though occasionally the numbness may be permanent. Any form of skin surgery will leave a scar. Because Mohs surgery preserves as much normal tissue as possible, scar formation is kept to a minimum & we will make every effort to provide as good a cosmetic result as possible.


A minimum follow up period of 5 years is recommended. This is because studies have shown that if you develop one skin cancer, there is a possibility that others will develop in the years ahead. We also like to have the treated area checked to make certain there is no sign of recurrence of the treated skin cancer. This follow up is usually carried out by your referring Doctor or Dermatologist. We will discuss the appropriate follow up suitable for your particular case. Should you notice any suspicious areas on your skin, you should of course have them checked by your doctor.