Dermatological surgery and laser unit

Providing a specialist service to treat skin cancer

Our dermatological surgery and laser unit (DSLU) is the largest and longest established centre in the UK with over 20 years of experience. We are a leading centre for Mohs micrographic surgery to treat skin cancer performing over 1,000 cases of Mohs surgery every year.

We offer photodynamic therapy for some low risk skin cancers.

As a tertiary referral centre for laser treatment to treat certain skin conditions, we offer a comprehensive laser service to treat birthmarks and certain pigmentary conditions.

We are the only hospital in the country using reflectance confocal microscopy on suitable patients, enabling us to view cells and structures of the skin without the need for a biopsy.

Mohs surgery explained

Watch clinicians talk about how Mohs surgery is used to treat skin cancer.

Mohs surgery: Jeremy’s story

Watch Jeremy as he talks about his experience of having Mohs surgery at our dermatological surgery and laser unit.


We are the first hospital in the UK to use a new microscope, called a Vivascope, which can detect skin cancer, providing such detailed images that it effectively performs a non-invasive biopsy.

Once validated, it will make it easier and quicker to determine whether moles and skin lesions are a cause for concern. This will:

  • reduce the number of precautionary biopsies
  • provide a diagnosis in uncertain cases - often such lesions are re-examined after three months
  • provide on-the-spot diagnosis - enabling patients to be examined, diagnosed and treated in a single visit
  • ensure there has been complete treatment for conditions suich as lentigo maligna or superical basal cell carcinomas, where topical treatments (medication applied to the skin) have been used.

This is just a small amount of the research we do in this area. If you’re a patient interested in finding out more, then speak to your consultant at your next appointment. If you are not a patient at Guy’s and St Thomas’ then speak to your own consultant in the first instance.


Tel: 020 7188 6407

Email: Gst-tr.

SKIN, a history

Read about Mohs surgery, laser treatment and skin imaging in SKIN, a history using our page turning software or download chapter 4 (PDF 1.91Mb).

Access guides

DSLU in the Cancer Centre accessibility information


My skin cancer meant I needed surgery on my face, I am not a medical expert by any means but I know what was done was brilliant, you can’t even tell

John Pindar, Mohs surgery patient