Affects only the outer layer of skin (epidermis). Characterized by redness, mild swelling, and pain (e.g. mild sunburn).
Step-by-Step Guidance
Immediately hold the burned skin under cool, gentle running water for 10 to 20 minutes.

Gently slip off rings, bands, or clothing near the burn before the area begins to swell.

If the skin is unbroken, apply a thin layer of aloe vera gel or moisturizing lotion to soothe the dry redness.

Cover with a clean, dry, sterile non-stick bandage or plastic wrap layer to protect from dirt.

Take ibuprofen or acetaminophen if needed to dull the local smarting.

3 - 6 days
Timeline is typical for uncomplicated healing. Always follow doctor guidance.