The Houston Fire Department said at about 3:45 p.m., it received reports of the fire in the 1500 block of Westheimer Road near Ridgewood Street.
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A viewer sent ABC13 a video of the Texas Tattoo Emporium as flames overtook the building.
While crews were fighting the fire, officials said that a person was inside the building and didn't want to leave but was eventually convinced to come out.
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The person was taken to a nearby hospital to get checked for possible smoke inhalation. It is unclear if the person inside was a client or an employee.
In an evening update, HFD also said that firefighters heard possible gunshots while putting out the flames. While authorities couldn't confirm there was a gun in the shop, they did say there was live ammunition inside.
Arson investigators are trying to determine what led to the fire.
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