 Pet rats can also develop pituitary tumors if they are given high @-@ calorie diets , and ringtail if they are placed in areas with low humidity or high temperatures . Staphylococcus spp. are a mostly benign group of bacteria that commonly reside on the top of the skin , but cuts and scratches from social and hierarchical fighting can open up the pathways for them to cause ulcerative dermatitis . 
