Doctors baffled by an unexplained rash on people's ears or cheeks should be on alert for a skin allergy caused by too much mobile phone use, the British Association of Dermatologists said on Thursday.

Citing published studies, the group said a red or itchy rash, known as "mobile phone dermatitis," affects people who develop an allergic reaction to the nickel surface on mobile phones after spending long periods of time on the devices.

"It is worth doctors bearing this condition in mind if they see a patient with a rash on the cheek or ear that cannot otherwise be explained," it said.

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