#1 By fixing your husbandry, buy a RELIABLE, thermostat (In the meantime you can use this http://www.lowes.com/pd_316275-539-T...lutron+dimmers until you get a t-stat)
Make sure the substrate is not damp, damp substrate promotes bacteria and can lead to several issues.
#2 At this point it is not looking too severe so change your substrate to clean paper towel and monitor your BP, if it get worse take your BP to a vet, if it remains the same way chances are what you see will be gone after one shed.