Understanding and getting to know your skin type is the first step in understanding your own unique skincare issues and what products to look out for.

Eucerin Head of Research and Development Stefanie Conzelmann, in a previous interview in DESTINY, explained that:

Normal skin has a good supply of blood, which lends to an even complexion. This skin type feels soft, smooth and usually doesn’t create any problems.

Dry skin has slightly flaky areas that may feel taut or itchy. The skin looks rough and patchy and could show signs of premature ageing. It’s also sensitive to external influences and changes in temperature. Dry skin lacks moisture and lipids.

Oily skin tends to have a shiny appearance caused by excessive sebum production. People with oily skin tend to suffer from enlarged pores and impurities, especially blackheads.

Combination skin has a distinct T-zone, which includes the forehead, chin and nose. These areas are oilier than others, so they tend to look shiny, while the skin on the cheeks is normal to dry.

Try: Pop into a Dermalogica concept store in Rosebank, the V&A Waterfront, Woodlands or Wembley for a free face-mapping session.

READ MORE: How to identify and deal with sensitive skin

Mona Gohara, a dermatologist at Yale Medical School, cited in Real Simple, says using a new product or not sticking to a routine can cause a facial irritation. “What’s more, using a wide range of products can make it difficult to single out what is causing a negative reaction,” says Gohara.

To find out which product—and, more specifically, which ingredient—is responsible, Gohara says you have to become a skincare detective. “I tell my patients to start the process with a clean slate. Eliminate everything and then reintroduce products every 10-14 days, because that’s how long it takes for your skin to react.”

According to Glamour, New York-based dermatologist and founder of BeautyRx Skincare Neal Schultz explains that you need a minimum of two weeks, but usually closer to a month, to see results.

Schultz says a moisturiser should have immediate effects and exfoliating products should take a week or two.

A good rule, he says, is the longer the issue tends to last, the more time a product needs to work its magic.

Tip: If a product stings, burns or causes redness, gently wipe or rinse it off and don’t use it again. It probably dries the skin out.