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A chemical burn, also known as a caustic injury, occurs when living tissue is exposed to corrosive substances such as strong acids or bases (alkalis). Unlike thermal burns, chemical agents can remain active on the skin, eyes, or internal tissues for extended periods, continuing to damage or destroy cells until the substance is deactivated, neutralized, or thoroughly washed away. Acids typically cause 'coagulative necrosis' which forms a protective eschar, whereas alkalis cause 'liquefactive necrosis' which penetrates deeper by dissolving fats and proteins, often resulting in more severe, progressive injuries.
Common symptoms
Redness, irritation, or intense burning at the contact site
Blisters, peeling skin, or scabs
Pain or localized numbness (numbness may indicate deep nerve damage)
Blackened or dead skin tissue (eschar), often associated with acid exposure
Blurred vision, stinging, or eyelid swelling if the chemical contacts the eyes
Coughing, shortness of breath, or chest pain if fumes are inhaled
Difficulty swallowing or severe abdominal pain if the chemical is ingested
Signs of shock, such as cool/clammy skin, rapid pulse, or shallow breathing
Possible causes
Strong acids (e.g., sulfuric acid in battery acid, hydrochloric acid in pool cleaners)
Strong bases or alkalis (e.g., sodium hydroxide in drain openers, ammonia, lime, cement)
Oxidants and peroxides (e.g., hair coloring agents, industrial disinfectants)
Solvents and paint thinners (e.g., gasoline, turpentine)
Reactive metals (e.g., lithium, sodium, or magnesium which react violently with water)
Hydrofluoric acid (a unique agent that penetrates deep into tissues and leeches calcium)
Medical treatment
Ensure safety: Wear gloves and eye protection before assisting the victim to avoid secondary exposure.
Remove dry chemicals: Gently brush off any powder or granular material with a cloth or gloved hand before using water.
Copious irrigation: Flush the affected area with cool, low-pressure running water for at least 20 to 30 minutes. For alkalis, longer irrigation (up to 60 minutes) may be necessary.
Decontaminate: Carefully remove all contaminated clothing, shoes, and jewelry while rinsing the area; cut away clothing if necessary to avoid spreading the chemical.
Eye irrigation: If chemicals splash in eyes, flush continuously with water or saline for at least 20 minutes while holding eyelids open; remove contact lenses immediately.
Cover the wound: After thorough irrigation, loosely wrap the burn with a sterile, non-stick dressing or clean cloth.
No neutralization: Do not attempt to neutralize an acid with a base (or vice versa), as the resulting chemical reaction can generate extreme heat and worsen the burn.
Ingestion care: If swallowed, do not induce vomiting. Give small sips of water or milk only if the person is conscious and can swallow.
Ayurvedic perspective
Chemical burns are categorized in Ayurveda primarily as 'Kshara Dagdha' (alkali burns) or 'Amla Dagdha' (acid burns). According to the Sushruta Samhita (Sutra Sthana, Chapter 12), chemical agents cause tissue destruction (Dagdha Vrana) by vitiating the Rakta (blood) and Pitta (heat) doshas. Alkali burns are considered particularly deep and painful because the 'Teekshna' (sharp) and 'Ushna' (hot) qualities of the chemical penetrate minute pores. The treatment focuses on immediate neutralization (Kshara-Amla interaction), cooling (Sheeta-Upakrama), and tissue regeneration (Vrana-Ropana). Classical texts emphasize that alkali burns should be treated with acidic substances like fermented rice water or citrus juices to neutralize the corrosive effect.
Ayurvedic dietary guidelines
Consume cooling and Pitta-pacifying foods such as coconut water, watermelon, and cucumber.
Include Cow Ghee (Go-Ghrita) in the diet to promote Dhatu regeneration and internal cooling.
Avoid spicy (Katu), sour (Amla), and salty (Lavana) foods that aggravate heat in the blood.
Sip on Lukewarm water infused with Sariva (Indian Sarsaparilla) to purify the blood and reduce internal burning.
Incorporate sweet fruits like pomegranates and grapes to support tissue healing.
Practice 'Patraadaana' by covering the burn with clean, cool Guduchi (Tinospora cordifolia) or Lotus leaves to provide a moist, sterile healing environment.
Avoid direct exposure to sunlight (Atapa) and fire-related heat, as it triggers Pitta and delays healing.
Keep the affected limb elevated if there is swelling (Shotha) to improve circulation and reduce pain.
Ensure adequate rest to allow the 'Dhatus' (tissues) to regenerate through the 'Ojas' building process.
Maintain high levels of hygiene to prevent secondary infections, which Ayurveda terms as 'Vrana-Dosha'.
