From A Wiki of Ice and Fire
Redspots is a common childhood disease similar to chickenpox. It is harmless to anyone under the age of ten and once one has it, he'll be immune to it for the rest of his life. However, adults who do not contract it in childhood remain at risk for infection and may die from it. Redspots causes red dots to appear on the face and body and an itching which is soothed with salves.