Melanotan I and Melanotan II popularly sold as "injectable tan" can lead to worrying changes in skin moles. Medical experts have issued warning regarding use of such tanning jab as these products are not been tested for safety, quality or effectiveness and that its side-effects were unknown. These products are advertised and sold illegally on the internet and in some tanning salons and body building gyms.

Two recent cases of women who had injected "Melanotan" shortly before noticing the problem of skin moles highlighted the risk from these tanning jab.

A spokesman for the British Skin Foundation said: "This drug is not licensed anywhere in the world. We don't know what the short- or long-term side effects are because there have been no thorough clinical trials carried out.

"We don't know what the health risks are and people should therefore steer clear of it."