Now that’s junk science.

An alleged fake doctor who performed hundreds of penis enlargement surgeries over the past two decades — despite only having a ninth-grade education — was arrested this week in Thailand, according to police.

Kittikorn Songsri, 36, taught himself how to do “silicone filler” injections as a teenager and was busted Sept. 19 during a sting operation at his townhouse in Samut Sakhon, where he performed the bogus procedures, cops told the Bangkok Post.

His totally nuts scheme was foiled when a badly infected customer complained to cops that he’d gotten, well, the shaft, according to the local Consumer Protection Police Division.

The customer reported that he had chronic pain after getting “penile pearls”— implants placed beneath the skin of the genitals — during a shoddy procedure, police said.

Even after receiving treatment, the patient said he couldn’t get an erection.

Songsri, who allegedly advertised the surgeries on social media, was busted when an undercover officer arranged to have one of the procedures.

Songsri allegedly told police he charged clients 20,000 baht each, roughly the equivalent of $615, and had seen two or three clients a month for the past 20 years.

He was charged with working as a doctor without a license.

Police raided his home, which was set up with beds and equipment and was deemed unsanitary by officers.