Phototesting patients

We are asking you to have phototesting because we think you may have one of the number of skin conditions that are triggered or made worse by ultraviolet (UV) part of sunlight, or rarely visible light.. Phototesting helps us find out which part of sunlight is causing your skin problem, and how sensitive you are to this. We use a machine called a monochromator to test small areas of your skin with ultraviolet and visible light. Our dermatologists can then diagnose and treat your skin condition.

The phototesting appointment (with a nurse) generally takes place on a Tuesday, and you will have to come back the following day to have your results reviewed by a dermatologist. (Patients with probable solar urticaria are tested and receive results on the same day).

It is important that you attend all scheduled appointments. Your GP (and referring dermatology department) will also be contacted with the results.

What is phototesting?

Phototesting is undertaken with a monochromator machine. It produces different wavelengths present in sunlight. Different doses are applied to the back (approximately 5mm in diameter). This helps the dermatologist diagnose which, (if any) parts of sunlight are causing your skin condition.

UVA and UVB will be used during this test, as UV light is the part of sunlight that causes most skin problems. The test is not painful.

While having this test, we will adjust your clothing to expose your back - please wear suitable clothing to allow this. We test small areas on your back, with you lying face down on a couch. We will mark your back with a marker pen to make it easy to read the test the next day by the dermatologists. Please wear suitable clothing to allow for your back to be exposed, but we also suggest you wear dark clothes to avoid the marker pen staining pale fabrics.

How long does a phototesting session last?

We normally test with a standard regime that takes upto an hour.

The nurse will make a note of any early reactions developing on your skin. The dermatologist will discuss the results of the test and the relevant treatment with you the following day.

What should I bring for my phototesting appointment?

• List of oral/topical medication that you normally take (including any skin treatments: creams and/or ointments).
• Any pictures you have of your skin condition (if not already seen by the dermatologist).
• You are welcome to bring something to read or listen to while having this test.

Important points to note:

• Please stop applying any steroid cream to your back three days before your phototesting appointment.
• Antihistamines should be avoided for 48 hours
• Moisturisers should be stopped the day before.
• If you have had too much sun exposure on your back or used sun beds within 6 weeks of testing, we may not be ablet to carry out the test. Please let us know in advance if this may be a problem. Please do not wash your back until after the results have been read by the dermatologist. This is to avoid the marker pen being washed off, so that the results can be reviewed.
• The ink used may stain clothes, please wear old/dark clothes.
• Children (under 16 years of age) must be accompanied by a parent/guardian.

What are the benefits of Phototesting?

• Phototesting helps us to diagnose photosensitivity and to discuss possible treatment.

What are the risks of Phototesting?

• If you are sensitive to sunlight, you will usually develop the same skin reaction that you have to sunlight on the small sites we use for phototesting.
• The doses of ultraviolet and visible light we use for testing are roughly the same as those experienced within 20 minutes of exposure to UK summer sunshine. In healthy skin, it is normal for the longest exposure to turn the skin slightly pink or produce a tan. The reactions normally fade over a few weeks.
• If you experience a strong response to the tests, the consultant will prescribe a steroid cream, which you should apply to the skin as directed, to reduce the reaction.

Where is the test performed?

The test is performed in one of the treatment rooms in clinic 7 outpatient department level 3.

Cancellation

If you need to cancel the appointment, please give us as much notice as possible so that we can try to reallocate your appointment slot.

Important numbers

If you have any queries or concerns about your phototesting appointment, please contact us on the numbers below:

Dermatology bookings office: 01223 216091 or email us on Email: dermsurgeryadmin@nhs.net

Dermatology secretaries: 01223 216501

Clinic 7 Reception: 01223 806000