Our skin type is likely to develop slightly over time (and seasons), so you should always adapt your cosmetic products to your current skin type.
If you don’t, even homemade / or purchased cosmetics can damage your skin and make it sensitive.
UV light from the sun and other factors such as stress, climate, air pollution, lifestyle, genes, nutrition and hormones can all contribute to how certain ingredients react or work on your skin.
Did you know that combination skin is the most common skin type? – but it is also the most difficult to care for, as the combination skin types (oily, sensitive, dry) have different needs. The dry spots need moisture, but too much can lead to excess oil in your T-Zone, causing blackheads to break out, etc.