Formaldehyde poisoning's dermatitis symptoms include skin redness, rash, and itching, with severe cases presenting with bumps, acne, and dandruff. If untreated, the condition may worsen, leading to skin ulcers, characteristic of contact formaldehyde poisoning. Firstly, it is crucial to leave the formaldehyde-contaminated environment and go to a well-ventilated area or, if possible, to receive oxygen treatment. Oral antihistamines such as cetirizine or loratadine can be taken to ease the symptoms. In cases with more pronounced symptoms, intravenous antihistamines like dexamethasone, calcium gluconate, and high doses of vitamin C should be administered to alleviate symptoms. If there are acne or bacterial skin infections, oral anti-inflammatory medications like cefprozil capsules should be taken, and intravenous anti-infection medications may be necessary to control symptoms. Workers regularly exposed to formaldehyde should wear protective clothing to prevent contact dermatitis. (Please use medications under the guidance of a doctor.)