Can I use Sudocrem for sweat rash?

Why cooling matters more than a barrier cream

Heat rash develops when sweat ducts become blocked or inflamed. Hot, humid weather, exercise, tight clothing and clothing that traps heat can contribute. Cooling helps reduce the sweating that drives the rash. Heat rash needs less heat and sweat, not a more elaborate cream collection.1

Sudocrem's US label covers diaper rash and protection from wetness, not every rash that happens to share a postcode. That product contains 15.29% zinc oxide as a skin protectant. Protecting skin from wetness is a different job from managing blocked sweat ducts, so its diaper rash directions are not a heat rash routine.3

Does the rash look like heat rash?

Typical heat rash causes small raised spots, an itchy or prickly feeling and mild swelling. Some spots contain fluid. The rash looks red on white skin but can look grey or white, or be harder to see, on brown or black skin. Adults often develop it where clothing rubs, including the upper body, neck and skin folds.14

What should I do instead?

1. 1Move somewhere cooler. Use a cool, ventilated room and remove wet clothing.
2. 2Reduce trapped heat. Wear loose cotton clothing, avoid tight or excessive layers, and use lightweight bedding at night.
3. 3Cool the skin with a cool bath or shower. For prickling, apply a cold damp cloth or an ice pack wrapped in a tea towel for up to 20 minutes.
4. 4Avoid further irritation. Pat or tap instead of scratching, avoid excessive soap, and skip perfumed shower gels and creams.

If itching remains troublesome, ask a pharmacist about calamine lotion, antihistamine tablets or hydrocortisone cream. Children under 10 need a doctor's advice before using hydrocortisone for heat rash. Calamine can dry the skin, so ask about suitable care if dryness develops rather than adding more products without a plan.14

What about babies and young children?

Babies and young children are more likely to get heat rash than adults. Keep a baby cool and dry in lightweight, soft cotton clothing. If using a fan, place it far enough away to provide only a gentle breeze. Avoid powders as well as creams and ointments: baby powder does not improve or prevent heat rash.25

How long should it take to clear?

Most heat rash clears within a day or two after moving to a cooler environment, although it can take a few days. See a doctor if it is not improving after a few days. For a child, call the pediatrician if the rash persists; seek advice sooner if you are worried about a baby's rash.145

When should I stop treating it myself?

Pus filled bumps do not automatically mean ordinary heat rash: infections and other skin conditions can look similar. Contact a doctor for severe pain, fever, yellow or green fluid, warmth or red streaks. Seek emergency help for a sudden, rapidly spreading rash with trouble breathing or facial swelling.67

If you have already applied Sudocrem and the rash worsens, stop using it and ask a doctor. The US label also tells you to seek advice if symptoms last more than seven days or clear and return within a few days. For suspected heat rash, use the earlier checkpoint of a few days without improvement.34