You rat has a bloody nose because it is sick actually the red discharge from his nose is not blood. You should take him to the vet ASAP
Orange skin is caused by buck grease.
Rat mucus is red so he just has a snotty nose.
That means that he is sick and he may have a disease in him or her.
Here is a page that talks about the skin of rats changing color.and pets with bloody noses. N.allexperts.com/q/Pet-Rats-3537/Change-skin-color.htm
Someone may have poisoned him or he may be snorting coke.