Orange Skin Most male rats have an oily, orange discoloration on the skin on their backs to varying degrees. This is completely normal and is due to testosterone. Recommended treatment: If your rat has a great deal of this film you can help by brushing him regularly and by bathing him when he becomes especially oily. A mild case of hormonal discoloration To link to this page: http://www.raisinrats.com/medical/orangeskin.html