Have you replaced any cleaning or personal care supplies lately? New box of the same old detergent, new bottle of shower gel? Companies change their ingredients all the time. You could be allergic to something new in your fabric softener. Or, could have developed a new sensitivity. How is your health overall? I find when I'm feeling particularly bad that I will develop patches of itchy, flakey skin on my arms. And I had to stop using the face cream I've used for 20 years this fall because it was causing a red, stinging, itchy, miserable rash along my jaw line and down my neck and chest.