Feature	1st-degree Burn (Superficial Burn)	2nd-degree Burn (Superficial Partial Thickness Burn)	2nd-degree Burn (Deep Partial Thickness Burn)	3rd-degree Burn (Full Thickness Burn)	4th-degree Burn (Deeper Injury Burn)
Affected Tissue Layers	Superficial layers of the epidermis	- Epidermis and upper layers of the dermis (papillary dermis) - Dermal appendages (hair follicles, sweat glands, and sebaceous glands) are spared.	Deeper layers of the dermis (papillary and reticular dermis)	Epidermis, dermis, and subcutaneous tissue	Epidermis, dermis, and deeper structures (muscles, fat, fascia, and bones)
Pain	Yes (localized pain)	Yes (especially with the movement of air or changes in temperature in the area surrounding the wound)	Yes (pain is typically felt on applying pressure)	No (perception of deep pressure is intact)	No (minimal perception of deep pressure)
Wound Blanching on Pressure	Yes, rapid refill	Yes, slow refill	No	No	No
Appearance	Similar to sunburn. Localized features include: Erythema, Swelling, Skin appears dry. No blistering.	Erythema, Swelling, Increased temperature of affected skin, Vesicles/bullae	Vesicles/bullae: fragile (rupture easily). Mottled coloration of the skin with red and/or white patches	Tissue necrosis with black, waxy-white, or gray leather-like skin (eschar). Skin appears dry and inelastic	Same to 3rd-degree burn
Prognosis	Healing within 3–6 days	Healing within 1–3 weeks	Healing takes 3 weeks or longer.	The burn does not heal by itself.	The tissue is dead and requires amputation.