I'm having Seborrhoeic dermatitis and taking Neurovit, Apo-cetirizine, Lysozyme 30mg. But I think I'm fever due to cold weather (I don't have a thermometer but I feel headache and dry-eyes).Can I take Acetaminophen-containing product at the same time?

Sure. Get a thermometer. You're taking a pricey mix of vitamins, an antihistamine, and lysozyme which is probably doing you no good. Seborrheic dermatitis is easily managed by evidence-based medicine -- what you're taking won't touch it but if you want "natural", you can choose from sulfur, coal tar, or a variety of other stuff that will. Best wishes.