There are basically 4 skin types, although a few people would say 5,as they classify 'normal' and 'combination' skin types separately, but I would like to classify them together, because they basically behave the same way.
1. DRY SKIN.
Dry skin can feel tight throughout the day, and may experience noticeable flaking and may appear scaly. Dry skin is largely due to a number of factors genetics, environmental factors, lifestyle & diet, hormonal changes. Dehydration is also a leading cause of dry skin, so if you're someone with dry skin, drinking plenty of water and avoiding alcohol and, caffeine as they can make a significant difference in how your skin looks and feels.
The best moisturizers for dry skin are those containing hyaluronic acid (often listed as sodium hyaluronate in ingredients), glycerin, and marine actives like algae, because of their ability to attract water and deliver it directly to skin cells. Emollients, including squalane and camellia oil, help smooth and hydrate your skin evenly and effectively.
2. NORMAL/COMBINATION SKIN
People with normal/combination skin often experience dryness on the cheeks, making it important to find a moisturizer that is not too heavy but one substantial enough to retain moisture where needed most so it's like a 50-50 thing. Those with normal skin are not prone to breakouts on their cheeks, and tend to have a well-moisturized t-zone. Gentle exfoliation is also important to keep the t-zone and cheek areas balances. Moisturizers with a gel-like texture are absorbed more quickly and less likely to cause breakouts. Start with a small amount and increase as needed to avoid over-moisturizing and stressing the skin.
3. OILY SKIN
Excess oil can oftentimes leave pores congested and clogged. The happy news however is that oily skin looks younger and more supple because it has more natural moisture and is less prone to wrinkle. Oilier skin is also prone to PIH (post-inflammatory hyperpigmentation), a condition which leaves dark spots on the skin after a breakout has healed. Exfoliation will also help lighten these dark spots by polishing away the uppermost layers of skin and revealing new cells. Those with moderate to severe acneic breakouts should consider using an exfoliator that includes anti-bacterial ingredients to speed healing and prevent future blemishes.
4. SENSITIVE SKIN.
Managing sensitive skin can be somewhat challenging, as it takes considerable time and effort to determine and avoid ingredients which cause inflammation and irritation. To make this process easier, introduce only one new formula or product at a time. This rule applies to both skincare and cosmetics. Patch testing a new formula on your inner forearm or the back of your ear, is an excellent way to minimize potential reactions on the face.
And it is also advisable to look for labels that identify formulas as non-irritating and non-sensitizing and free of parabens, synthetic fragrances, mineral oil, sulfate detergents, phthalates, urea, DEA or TEA, as these ingredients can result in redness and itchiness.
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