Why do I still get sunburned even I put sunscreen?

Understanding why sunscreen may not be effectively preventing your sunburn can hinge on several factors. First, ensure the sunscreen you choose has a broad-spectrum label, protecting against both UVA and UVB rays. It's crucial to apply it generously—most people only use half the recommended amount, which significantly reduces its effectiveness. Remember to reapply every two hours, or more frequently if swimming or sweating. Additionally, consider environmental factors such as your location; high altitudes and reflective surfaces like water or sand can increase sun exposure. Lastly, make sure the sunscreen is not expired and is properly stored, as heat can affect its potency. Incorporating physical blockers, like wearing UV-protective clothing or seeking shade, can also improve your sun safety. Finally, consulting with a dermatologist for personalized guidance can provide further insights into your specific skin needs.