The Irish Medicines Board has issued a warning about a product called Magicream, which claims to treat eczema.
The board says the product contains a steroid and a substance used to treat fungal infections which require special authorisation in order to be legally sold on the Irish market.
The label does not list the two ingredients - which the IMB says renders the product an illegal medicine here.
It says Magicream - which can be bought over the internet - is not authorised for marketing in Ireland and cannot be considered safe.