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This really depends upon the type of machine used by a clinic and your skin and hair colour.
There is a wide variety of equipment promoted by around thirty manufacturers and distributors in the U.K..
Some of the newer machines available claim that they can treat all skin types and hair colour, however other pieces of equipment may be more limited. As a result, some clinics may not be able to treat you for the following reasons:
General reasons of unsuitability not related to skin and hair type include:
Any drug can cause photosensitivity, although some are known to cause it more than others, hence the importance of a full medical history. If you are currently taking a particular medication and have not had a problem with summer holiday sunshine since being on these drugs then you should be fine, but an experienced medical practitioner will be able to discuss your specific case.
About 5% of epileptic patients have photosensitive epilepsy. These patients are theoretically more likely to have an attack if they are exposed to strobes or camera flashes. If the epilepsy is non-photosensitive (i.e. 19 out of 20 patients) then IPL/laser hair removal is considered safe. For those with photosensitive epilepsy, so long as the area being treated is well away from the eyes and the patient is wearing blackout goggles (i.e. they cannot see the flash of the IPL), then there should be no problems.