Sunburn and Heat Rash (Prickly Heat)

Sunburn

What it is

  • Skin damage from too much ultraviolet (UV) radiation from the sun or tanning beds. It can range from mild redness to painful blistering.

Symptoms

  • Red, warm, tender skin 2–6 hours after sun; peaks at 24 hours.
  • Swelling, tightness, and sometimes blisters.
  • Fever, chills, headache, nausea in severe cases (sun poisoning).

Immediate care

  • Get out of the sun right away and into shade.
  • Cool the skin: cool showers, damp cool compresses 10–15 minutes several times a day.
  • Moisturize: apply a gentle, fragrance-free lotion or aloe gel; for very dry/tight skin, use a thicker cream or petrolatum.
  • Pain/fever: acetaminophen or ibuprofen as directed.
  • Hydrate: drink extra water for 48 hours.
  • Blisters: do not pop. If they open, wash gently, apply petroleum jelly, and cover with a nonstick bandage.

When to seek care

  • Extensive blistering, severe pain, confusion, fainting, persistent fever, signs of dehydration, or infection (increasing redness, pus, streaking).
  • Sunburn on infants under 6 months—call your clinician.

Prevention next time

  • Broad-spectrum SPF 30+ sunscreen, applied generously and reapplied every 2 hours and after swimming/sweating.
  • Protective clothing and hats; seek shade 10 a.m.–4 p.m.
  • Avoid tanning beds.

Skin peeling and healing

  • Peeling is part of healing and may itch—don’t pick. Keep moisturizing. New skin will be more sensitive; protect it carefully.

Heat Rash (Prickly Heat, Miliaria)

What it is

  • Tiny, itchy or prickly bumps when sweat ducts get blocked, trapping sweat under the skin. Common in hot, humid weather and under tight clothing.

Symptoms

  • Small red or clear bumps, prickling/itching or stinging.
  • Appears in covered, sweaty areas: neck, chest, back, under breasts, groin, elbow creases.
  • In babies, often in skin folds or where clothing/blankets trap heat.

Care at home

  • Cool down: move to a cooler place; use fans/AC; take cool showers.
  • Keep skin dry: loose, breathable clothing; avoid heavy creams on sweaty areas.
  • Soothe: calamine lotion or lightweight fragrance-free moisturizers; oral antihistamines at night for itch if needed.
  • Avoid further friction and heat until clear.

When to see a clinician

  • If rash becomes painful, very red, swollen, has pus, or you develop fever (possible infection).
  • If it doesn’t improve in a few days with cooling and dryness.

Prevention

  • Stay cool and dry; choose moisture-wicking fabrics.
  • Take breaks in shade/AC; keep skin folds dry; consider absorbent powders (talc-free).

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