EUROPE’S drugs regulator is looking into three new conditions to assess whether they may be possible side-effects related to Covid-19 vaccines from Pfizer and Moderna following a small number of cases.

Erythema multiforme, a form of allergic skin reaction, and glomerulonephritis and nephrotic syndrome, disorders related to kidneys, are being studied by the safety committee of the European Medicines Agency (EMA), according to the regulator.

The mRNA technology used by the two vaccines has been a turning point in the pandemic and for the scientific community, with their high effectiveness against Covid-19, but some rare side-effects of the shots are being studied as more people are inoculated globally.

Last month, the EMA found a possible link between very rare heart inflammation and the mRNA vaccines. However, the European regulator and the World Health Organisation have stressed that benefits from these vaccines outweighed any risks posed by them.

The EMA did not give details on Wednesday as to how many cases of the new conditions were recorded following vaccination with the Pfizer and Moderna shots, but said it has requested more data from the companies to study any potential relation between them.

Pfizer and Moderna did not immediately respond to Reuters requests for comment.