Police on Wednesday arrested two women on suspicion of unlicensed medical practices, possession of poisons and antibiotics and using false instrument, after raiding a beauty centre in Mong Kok.

The two women, aged 34 and 36, were working at the unlicensed clinic in Mong Kok which has been in operation for at least two years. Police said they suspect the beauty centre had provided Botox injections to about 700 to 800 people in the past year.

During their operation, officers seized botulinum toxin, steroid injections, whitening injections, antibiotics, and fake medical receipts.

Superintendent Alan Chung said officers will get in touch with customers to see if they experienced any post-treatment discomfort.

"We believe that since some customers have developed symptoms such as redness and swelling after the injections, the clinic intentionally provides these antibiotics to alleviate their symptoms, so that the customers won't go to the public hospital and won't expose this place," he said.

Chung added that preliminary findings showed that the case is not directly linked to unlicensed medical practices at a beauty centre in Lai Chi Kok.