Papular urticaria is not contagious, so you can rest assured. It's a skin reaction caused by insect bites or allergies and is not transmitted to others through contact or air. Daily precautions and care are all that's needed.

1. **Cause unrelated to infectivity:** This disease is mainly caused by bites from insects such as fleas and mites, or by allergies to certain substances. Symptoms include red papules and itching, but the lesions themselves are not contagious and will not spread through normal contact with family and friends.

2. **Symptoms can be easily confused with infectious skin diseases:** The rash may appear in patches, accompanied by intense itching, and can sometimes be mistaken for infectious diseases such as chickenpox. However, the difference is that it does not have the contagious characteristics caused by viral or bacterial infections.
3. **Individual reactions vary considerably:** In the same environment, some people experience obvious symptoms after being bitten, while others have no obvious reaction. This is mainly related to individual constitution and immune sensitivity, and is not due to infection.
We recommend taking precautions against insects, such as using mosquito nets, wearing long-sleeved clothing, and keeping the environment clean. If the rash persists or worsens, please seek medical attention promptly for diagnosis and avoid scratching to prevent infection. Keeping your skin clean and dry daily, and reducing contact with allergens, will help relieve discomfort.