Many people—children and adults—prefer to use spray sunscreen. It’s easier to apply, great for covering hard-to-reach spots (such as the scalp, back of the neck and shoulders, and tops of feet).

DEAR DR ROACH: I have a cold. I use two brands of nasal spray for congestion, but both say not to use them for more than three days as they may cause “rebound” congestion. Can I alternate them ...