Smart Phone Fingers?

The patient is a 15 yo girl with a 2-3 year history of painful thumbs. The palmar surface of her thumbs were glazed with decreased fingerprint markings. She has mild hyperhidrosis palmaris. One great toe has mild plantar hyperkeratosis but is not glazed like the thumbs. I noticed a cell phone in her back pocket and asked her to show me how she uses it (see below). She's had this for three years. Her father said she's on the smart phone for hours a day.
Is this a new entity? Contact? Irritant? Repetitive Trauma? Comments?