Chemical burn: first aid and seeking medical attention

A chemical burn occurs when the skin, eyes, or mucous membranes come into contact with acids, alkalis, oxidizing agents, solvents, and other substances that cause coagulative or liquefactive necrosis. Unlike thermal injury, the damage can worsen until the chemical is removed and its action is stopped, so the speed and correctness of the initial actions determine the outcome. [1]

First aid almost always involves immediate removal of the chemical agent followed by prolonged rinsing with running water. Exceptions are rare and concern specific substances, as discussed below. Delayed decontamination increases the depth of the burn and the risk of scarring. [2]

In the case of chemical burns, do not attempt to "neutralize" the substance with improvised means. The neutralization reaction is often accompanied by the release of heat, which leads to additional tissue damage. A safer and more effective approach is prolonged rinsing with water and removal of contaminated clothing. [3]

The danger of chemical trauma also lies in its systemic toxicity. Some agents are absorbed through the skin, affecting the heart, lungs, kidneys, and nervous system. Therefore, even small lesions require observation and a low threshold for seeking medical attention. [4]

The mechanism and types of chemical burns: what damages tissue

Acids typically cause coagulative necrosis with the formation of a dry scab, which partially limits further penetration of the substance. Initial pain can be severe, and the depth of damage is sometimes less than expected. This does not negate the need for prolonged irrigation and medical evaluation. [5]

Alkalis act differently. They saponify lipids and cause liquefactive necrosis, quickly penetrating deep into the tissue. Therefore, alkali burns are often deeper than they appear in the first few hours and require longer irrigation and more frequent observation. [6]

Solid powders and granules can adhere to skin and hair, causing further damage. The first step is to dry-clean the particles from the surface, then begin rinsing with water. This procedure is especially important for burns caused by dry lime, which forms a caustic alkali when in contact with water. [7]

Certain substances require specific tactics. Key examples include hydrofluoric acid, phenol, white phosphorus, and cement mixtures. Specific protocols have been developed for these substances, which complement the general decontamination steps. [8]

Table 1. Types of chemical agents and damage characteristics

Agent	Type of necrosis	Risk of deepening	First aid features
Acids	Coagulation	Average	Long-term rinsing with water
Alkalis	Colliquation	High	Very long water flushing, early depth assessment
Dry powders	Depends on the composition	Average	First dry removal of particles, then rinsing
Special agents (hydrofluoric acid, phenol, white phosphorus, cement)	Various mechanisms	High	Universal steps plus specific measures

Universal algorithm for first aid on the skin

Step 1: Ensure safety. If possible, wear gloves and avoid contact with the source to avoid secondary contamination. Remove and isolate contaminated clothing and jewelry. It is unsafe to assist without personal protection. [9]

Step 2: For dry powders, first gently shake or brush off the particles with a dry cloth, card, or brush, without rubbing them into the skin. Then begin rinsing. This procedure reduces the risk of an increased reaction when adding water. [10]

Step 3. Rinse with running water. Most victims require prolonged irrigation with cool water for at least 20 minutes, and for alkali burns and persistent pain, up to 60 minutes or longer. If pain persists, continue rinsing for several more minutes. [11]

Step 4. After rinsing, apply a clean, non-adhesive dressing. Do not use greasy creams, oils, or alcohol. Do not attempt to neutralize the wound with improvised means. Any questionable situation, large area, or specific areas affected requires a medical evaluation. [12]

Table 2. Do's and Don'ts for Chemical Skin Burns

Do	Do not do
Remove contaminated clothing and jewelry	Leave soaked fabrics on the body
Shake off dry powders before rinsing.	Immediately pour water over the dry lime
Rinse with cool water for a long time	Try to neutralize acid with alkali and vice versa
Cover the wound with a clean, non-adhesive dressing.	Use oil, fatty creams, alcohol
Seek medical evaluation if in doubt	Wait if the pain increases or the area is large

Special Agents: When Specific Measures Are Added to Basic Steps

Hydrofluoric acid is dangerous not only because of local burns but also because of systemic hypocalcemia and arrhythmias. After immediate irrigation, apply 2.5% calcium gluconate gel, reapplying every 15 minutes until pain subsides. For severe lesions, consider calcium injections or infusions according to protocol. Electrolyte and cardiac rhythm monitoring are necessary. [13]

Phenol rapidly penetrates the skin and is systemically toxic. Low-molecular-weight polyethylene glycol is preferred for dermal decontamination. If special solutions are not available, immediate rinsing with copious amounts of water is permitted, followed by switching to polyethylene glycol at the earliest opportunity. [14]

White phosphorus continues to burn when exposed to air. First aid includes removing the particles, copious irrigation with cold water, covering with wet wipes to limit oxygen access, and careful visual inspection of the particles, using an ultraviolet lamp if necessary. Copper sulfate is no longer recommended due to toxicity. [15]

Cement mixtures and mortars contain alkali and cause deep burns with prolonged contact. First, shake the dry cement off your skin and clothing, then rinse with water for at least 20 minutes, and often longer, until the burning sensation subsides. The sooner you begin removing the impregnated materials, the shallower the burn. [16]

Table 3. Specific agents and additional steps

Agent	Additional measure after rinsing	For what
Hydrofluoric acid	Calcium gluconate gel 2.5% with repeated application	Bind fluoride ions, reduce pain and depth
Phenol	Low molecular weight polyethylene glycol	Improve the dissolution and removal of phenol
White phosphorus	Keep the surface moist, remove particles, avoid copper sulfate	Stop burning, reduce toxicity
Cement, dry lime	Dry powder removal followed by long rinse	Prevent the reaction from intensifying and deepening

Chemical eye burn: steps to take

Irrigation begins immediately, pending clarification of the substance. Clean water, saline, and buffer solutions are suitable. Irrigation continues for at least 30 minutes, and in cases of persistently alkaline or acidic conditions, until the surface acidity returns to normal. Contact lenses are removed as soon as possible. [17]

Acidity is monitored using an indicator strip in the conjunctival fornix. The target range is approximately 7.0-7.2, after which irrigation is repeated after a few minutes to confirm stability. Any remaining particles from under the eyelids are carefully removed. [18]

Anesthetic drops are acceptable to facilitate irrigation, but they should not delay the start of irrigation. After initial care, an ophthalmologist examination is necessary to assess the extent of the damage, prevent infection, and prescribe medications to prevent adhesions. [19]

Alkaline eye lesions are more severe and require longer irrigation, sometimes for hours, with repeated acidity monitoring. With white phosphorus, particle removal guidelines are followed and toxic imaging agents are avoided. [20]

Table 4. Eye irrigation for chemical burns

Step	Detail	Target
Start right away	Any available clean water or solution	Reduce the concentration of the agent
Remove lenses	If possible, in the first minutes	Remove the source of chemical retention
Acidity control	Indicator strips, target 7.0-7.2	Guideline for adequate rinsing
Re-check	A few minutes after normalization	Prevent acidity from recurring
Examination by a specialist	After initial aid to all victims	Prevention of complications

Assessment of severity and indications for urgent medical care

The area, depth, and location determine the treatment strategy. Burns to the face, hands, groin, feet, joints, and any burns in children and the elderly require immediate in-person evaluation. Severe chemical burns often require hospitalization. [21]

Signs of deterioration at home include increasing pain after 48 hours, increasing redness and swelling, the appearance of foul-smelling discharge, fever, and lack of epithelialization by the end of the second week. These signs require discontinuing self-medication and consulting a doctor. [22]

If systemic toxicity is suspected, laboratory testing is performed as indicated, including calcium, magnesium, and potassium levels in cases of hydrofluoric acid injury, as well as an electrocardiogram. Specific therapy is determined based on clinical data. [23]

Any chemical injury to the respiratory tract or ingestion of corrosive substances requires immediate medical attention. Do not induce vomiting or "neutralize" with beverages. Small sips of water may be given to contacted and resistant victims, but only as a temporary measure until examination. [24]

Table 5. Red flags after primary care

Sign	Possible cause	Action
Increased pain after 48 hours	Deepening of the lesion, infection	Urgent in-person assessment
Spreading redness and swelling	Ascending inflammation	Stop self-medication and see a doctor.
Foul-smelling discharge, fever	Infection	Start treatment as prescribed
No epithelialization by day 14	Greater depth	Correction of tactics
Lesions of special zones, children, elderly	High risk of complications	Observation by a specialist

Post-decontamination treatment: dressings, pain relief, care

After adequate irrigation, modern dressings that maintain a moist wound environment play a key role. For superficial and partial burns, non-adhesive silicone meshes, hydrogels, and other dressings are most often suitable, reducing pain during dressing changes and promoting epithelialization. The choice depends on the depth and amount of exudate. [25]

In outpatient practice, silver ion creams do not demonstrate a healing benefit in many patients and may require more frequent dressing changes. The decision to use them is individualized, but preference is often given to modern, drug-free dressings. [26]

Fatty ointments and cosmetic oils are not used initially due to the risk of heat retention and maceration. Their role may only become apparent in later stages, when the goal is to reduce dry skin and itching after epithelialization. Pain is controlled with systemic analgesics according to the instructions. [27]

Prophylactic systemic antibiotics are not indicated for pure chemical burns without signs of infection. After initial care, the eyes require specialized treatment, including adhesion prevention and intraocular pressure monitoring as prescribed by an ophthalmologist. [28]

Table 6. Home care plan for 14 days after a chemical skin burn

Period	Actions	Benchmark for success
Day 0	Decontamination according to the algorithm, non-adhesive dressing	Reduction of pain and burning sensation
Days 1-3	Regular dressing changes, maceration control	Reduction of exudate
Days 4-7	Switch to more occlusive coatings when drying	The beginning of epithelialization
Week 2	Emollients for itching, protection from friction and sun	Almost complete epithelialization
Any day	Signs from Table 5	Urgent in-person assessment

Common situations and mistakes: how to avoid harm

The most common mistake is attempting to neutralize the chemical with improvised means. This reaction generates heat and worsens the burn. The only correct tactic in the first few minutes is to remove the substance and rinse thoroughly. [29]

It is dangerous to rinse dry lime and other caustic powders with water until the particles are completely removed. Dry cleaning is recommended first, followed by rinsing. This rule reduces the risk of aggravating the reaction and increasing the depth of damage. [30]

When dealing with phenol, attempting to use only water may be insufficient due to its poor solubility. Low-molecular-weight polyethylene glycol is used whenever possible. This accelerates phenol removal and reduces systemic burden. [31]

For white phosphorus, the use of copper sulfate to visualize particles has historically been used, but is now considered unsafe due to copper toxicity. Particle removal, irrigation, the use of wet dressings, and, if available, an ultraviolet lamp are recommended. [32]

Table 7. How long to rinse: guidelines for different situations

Situation	Minimum duration of rinsing	Additionally
A typical chemical burn of the skin	20 minutes	Longer if pain persists
Alkali burn of the skin	Up to 60 minutes and longer	Re-evaluation of pain and condition
Eye burn	At least 30 minutes	Until acidity is normalized to 7.0-7.2
Dry powders	First dry removal, then as above	Do not rub particles
Special agents	According to the universal algorithm plus measures from Table 3	Early medical assessment is essential

Brief conclusion

Minutes are crucial in the case of a chemical burn. The universal principles are personal safety, removal of contaminated clothing, dry removal of powders, and prolonged rinsing with water. No homemade neutralization. Specific measures apply to specific agents: calcium gluconate gel for hydrofluoric acid, polyethylene glycol for phenol, damp cover and thorough particle removal for white phosphorus, and dry removal of cement before rinsing. In case of eye damage, specific areas, large areas, or signs of deterioration, immediate emergency medical attention is necessary. [33]