Everyone from beauty therapists to doctor will have to take extra qualification if they want to carry out non-surgical cosmetic treatments such as dermal fillers - a report into the industry is expected to say.
The British Association of Aesthetic Plastic Surgeons gave a cautious welcome to the idea, but said that it wanted only medical professionals to be allowed to perform treatments.
Its president, Rajiv Grover, said: "It's not only important enough to be able to wield the syringe but people also have to be able to deal with the possible complications resulting from this treatment".
The review into plastic surgery by NHS medical director Sir Bruce Keogh will be published later this month.
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Two knives were found at the scene in Islington, North London, and the suspects fled on foot before being arrested.
The violence began after a counter-protester allegedly doused a female rally organiser with pepper spray.
As temperatures climb through the day, the warmest spots are likely to be across western parts of Northern Ireland and western Scotland.