On the eve of Holi, doctors today advised people to use organic colours only, and warned that wearing contact lenses when playing the festival of colours may harm eyes. Both chemical and natural colours are available in the market, and medical and environmental experts have been pitching for the use of latter. "Chemical colours can irritate the skin by causing itching, rashes, swelling and aggravated eczema.

Colour can compromise the eyesight resulting in severe irritation, redness, watering and itching. The scalp can get affected, leading to hair damage and hair fall," said Naresh Bhargava, senior consultant in the dermatology department at Fortis Hospital in Shalimar Bagh. Bhargava added that people should oil or moisturise their face and body before stepping out to play with colours. The president of Indian Medical Association (IMA), K K Aggarwal, said the green colour has malachite, which can harm eyes. "Glass in colours can harm skin. Also, balloons can cause head injury. Use of contact lenses while playing Holi can harm eyes," he said. The IMA chief also cautioned that "consuming 'bhang' can harm the heart".