Most commercial mosquito repellents contain chemicals like DEET (N,N-Diethyl-meta-toluamide), Picaridin, or IR3535. While these chemicals are known to repel mosquitoes effectively, prolonged use can lead to a host of side effects, including:

Skin irritation and allergic reactions

Respiratory issues in sensitive individuals

Neurotoxicity with prolonged or excessive use

Environmental damage, especially to aquatic life

Repeated use, especially on children or individuals with sensitive skin, can be harmful in the long term.