Dermatologists Say 1% Hydrocortisone Can Ease Heat Rash as Blocked Sweat Ducts Trigger Bumps
Updated
Updated · The Cut · Jul 22
Dermatologists Say 1% Hydrocortisone Can Ease Heat Rash as Blocked Sweat Ducts Trigger Bumps
3 articles · Updated · The Cut · Jul 22
Summary
Heat rash usually clears within a few days once overheating stops, dermatologists said, with more significant flares sometimes taking up to 1-2 weeks to fully resolve.
Blocked sweat ducts trap perspiration under the skin, causing inflamed red, clear, or skin-colored bumps—often after heat, humidity, exercise, tight synthetic clothing, or heavy moisturizers and sunscreens.
Cooling the skin is the main treatment: cool showers, cold compresses, air conditioning, and loose cotton or moisture-wicking clothes; for body rashes, over-the-counter 1% hydrocortisone, calamine, or pramoxine can reduce itching.
Facial heat rash needs a gentler approach because it is often mistaken for acne, rosacea, or dermatitis; dermatologists advise pausing heavy makeup, oils, acids, retinoids, and vitamin C, and avoiding routine hydrocortisone use on the face.
To prevent recurrence, doctors recommend changing out of sweaty clothes quickly, showering after heat exposure, avoiding heavy occlusive products in summer, and using talc-free powder in skin folds when friction is a trigger.