Contact with peracetic acid causes chemical burns that can range from mild redness to severe tissue damage. The injury may not feel painful right away, but the chemical continues to damage skin even after initial contact.
How peracetic acid affects the skin
Peracetic acid is a strong oxidizing agent. When it touches skin, it breaks down cell structures through oxidation, similar to a burn caused by heat. The outer layer of skin may first turn white or pale, then become red and swollen. With higher concentrations, there is immediate burning pain. With weaker solutions, symptoms may be delayed, giving a false sense of safety while the chemical penetrates deeper.
What the damage looks like over time
Within minutes, the affected area may blanch or turn red. Over the next few hours, blisters can form, and the skin may break down into ulcers. Unlike some acids that stop damaging once rinsed, peracetic acid can keep reacting, leading to deeper injury. Severe exposure can destroy skin layers down to fat or muscle, requiring long-term medical care.
Immediate first aid steps
Flush the area with large amounts of water for at least 15 to 20 minutes. Use an emergency shower if available. Remove contaminated clothing or jewelry while rinsing, but do not stop the water flow. Do not try to neutralize the acid with baking soda or other substances—this can create heat and make the burn worse. After rinsing, cover the area with a clean, sterile cloth and get medical help right away.
Medical treatment and recovery
Treatment is similar to that for serious thermal burns. Doctors may clean dead tissue, apply antibacterial creams like silver sulfadiaz inflammation. Deep burns may require skin grafts. Healing can take weeks or months, and scarring is common. Pain management and wound care are key parts of recovery.
How it compares to other industrial chemicals
Compared to hydrogen peroxide, peracetic acid is more aggressive and penetrates faster. Unlike mineral acids that cause surface corrosion, peracetic acid oxidizes tissue more deeply. It differs from caustic chemicals like sodium hydroxide, which turn skin into soap, but both require the same emergency response: immediate and thorough rinsing.