Use sun cream after every 2 hours whether you are at home or at work. Use sun cream which has more SPF. Generally SPF starts at 20, If you use sun cream with more SPF, It will protect your skin.
There are 5 basic skin types: Normal, Dry, Oily, Sensitive and Sun-damaged. Your skin type is determined by how much -- or how little -- oil your skin produces. Genes, diet, stress level, hormonal fluctuations, medication and even your skincare regimen all determine how much oil your skin produces.