I was told not to go out in the sun as skin is very sensitive and will burn. Sounds like exposure to the sun has caused your condition. Yes always go to your doctor if unsure, they'll set you straight. My condition was not caused by the sun, more from the chemo or the Dexa I think. it went away after a few days so not sunburn more of a rash. Most likely the Dexa, hard to tell when you have so many meds going around your body. The neulasta has given me other side effects, pain in the joints and muscles. Hoping your treatments is going well. Xxx