"We have to be careful because it's a sensitive part of the body", Wattanasiri told Daily Star.
The procedure of "Penis whitening" is channelized by the Lelux Hospital in Bangkok, which had performed the procedure on more than a dozen patients.
According to the BBC, penis whitening is a troubling trend for the country, which is wondering whether the beauty industry has gone too far.
This odd trend came into being, when a man was unhappy with the dark parts of his groin and underwent a laser treatment to get his crotch lightened and was very happy with the results of the whitening treatment.
"Penis whitening" laser treatment is the recent viral story in Thailand
Lelux Hospital in Bangkok, Thailand started to offer a freakish treatment about six months ago after one of its male customers complained of dark parts on his groin. The Lelux Hospital has been performing skin bleaching operations for a while now and they've seen an uptick in the new penis whitening fad.
The trend is largely attributed to the lingering traditional perception that having fair skin means not being part of the working class, and not having to work in the fields.
It uses laser whitening technology which is aimed at a particular body part a person wants lightening.
A skin-whitening cream, for instance, put an ad above the seats on Bangkok's public transport, saying: "Only white people can sit here".
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Most clients were aged between 22 and 55, with many from Thailand's LGBTQ community.
"These days a lot of people are asking about it", Bunthita Wattanasiri, a manager for the Skin and Laser department at Lelux Hospital, told AFP. Overall, Lelux says more than 50% of its patients are coming for such treatments. Last year, it offered a procedure in which a female customer's own body fat is used to make genitalia plumper.
Since the hospital released pictures of a man undergoing the procedure on Thursday, interest is expected to get even bigger.
"The skin of the private parts is sensitive", deputy director-general Dr. Thongchai Keeratihuttayakorn of the Health Service Support Department said.
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Another user Parin Ruansati posted: "Oh god. what ever happened to the world?"
The trend to make one's skin look whiter has been accused of promoting racism.
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