My husband woke up with these raised pale red welts spreading across his neck and arms. We are hours from urgent care right now. What can we do?

Itching points toward hives. So does swelling that comes and goes, especially if the welts are smooth and raised rather than rough or scaly. Hives also commonly flare after a new food, medication, insect sting, viral illness, hot shower, pressure from tight clothing, or a new soap or detergent.

Things that make me pause and think beyond hives include bruised-looking purple spots, blisters, peeling skin, painful sores in the mouth, high fever above 101.5°F, or a rash that hurts more than it itches. Those deserve medical evaluation sooner because they can point to something other than ordinary hives.

4. What to do in the next 10 minutes

Have him stop whatever he is doing and sit somewhere cool. Heat often makes hives itch and spread more. Loosen collars, remove watches or tight sleeves, and have him avoid scratching if he can, because rubbing can trigger more welts.

Think quickly about new exposures in the last 24 hours: any new medication, antibiotic, pain reliever, supplement, food, energy drink, insect sting, plant exposure, or body product. If something obvious stands out, stop that exposure unless it is a prescribed medication he absolutely needs for a life-threatening condition, in which case call a medical professional for guidance.

5. An antihistamine is usually the first home treatment

If he is alert, able to swallow, and not having breathing symptoms, an over-the-counter antihistamine is often the most helpful first step. The non-drowsy options many adults use are cetirizine 10 mg, loratadine 10 mg, or fexofenadine 180 mg. These are commonly taken once daily, and cetirizine often works a bit faster for itching, though it can still make some people sleepy.

Diphenhydramine, often 25 to 50 mg in adults, may also reduce itching, but it causes more drowsiness, slowed reaction time, and dry mouth. I would be cautious with that one if he may need to stay alert, drive, hike out, or make safety decisions. Do not combine multiple antihistamines casually unless a clinician has told you to do that.

6. When not to give over-the-counter medicine without checking first