My husband who is 47 yrs old, about the last 3 weeks has had small tiny blisters appear in various places like forehead, back, shoulder, chest & arms. Sitting here at home just now, one popped up on the inner part of his forearm. Didn t feel anything biting per say. We have not changed anything in our laundry, foods or everyday habits. I am not effected by anything like this. What in the world could it be?