That looks to me like your rabbit could have myxomatosis, if you are in a country that has this disease(Europe, Australia, New Zealand, South and Central America, west coast of the US), and there's swelling around the eyes and nose(as it appears there might be in the picture). It can be fatal and your rabbit will need to be put on the appropriate rabbit safe antibiotic to help deal with the secondary infections that occur. Your rabbit may also need to be put on anti inflammatory/pain meds and may need to be syringe feed rabbit recovery mix if your rabbit isn't eating very well on it's own. You need to take your rabbit to a knowledgeable rabbit vet immediately. There is information on the illness in these links. http://www.medirabbit.com/EN/Skin_diseases/Viral_diseases/Myxo/Myxo.htm http://wildpro.twycrosszoo.org/S/00dis/viral/Myxomatosis.htm