If you’ve spent any time perusing bath and body products, you might have found yourself wondering what exactly the difference is between a hand cream and a body lotion, or even a whipped lotion versus a bar. After all, they’re all moisturizers, right? While that is true, we are here to outline the differences between all the lotion types available on the market, so you stay informed about which to use and where.

For starters, creams and lotions are distinguished by their “viscosity.” This is basically a classification of thickness. Some lotions have a very low viscosity, while creams hit the higher ranges. In other words, the thicker the substance, the higher the viscosity, the more likely it’s considered a cream. The viscosity is formed by an oil to water ratio. Body butters fall within the cream distinction, as do many whips. This doesn’t seem like a big deal, and in the grand scheme of things, it isn’t. However, when dealing with lotions, it’s important to get the right one for the job.

For instance, you might have noticed that hand creams and butters are much thicker than your average skin lotion. This isn’t a fancy marketing trick. Your hands easily dry out due to their constant use. This can happen from work, cleaning, frequent hand washing, or simply a lack of protection from the sun. Thicker creams provide more hydration which in turn better moisturizes the skin on your hands. Many are made from thicker oil-based ingredients, such as shea butter, and include restorative elements like vitamin E.

In direct contrast, face lotions tend to be very light and include little or no oil. The water base ensures hydration, but the lack of oil keeps the lotion from clogging pores and causing acne breakouts. There is a term for lotions that do not clog pores: non-comedogenic. The only exception to this is lip care. The thicker it is, the better, as lips have a tendency to dry out quickly. Often, lip care products are made with beeswax, one of the thickest substances found in the bath and beauty realm.

As for the rest of your body, the moisturizer you use will depend on your skin type or the time of year. Those with very dry skin should choose body butters and whips, while those with skin that generally tends to stay hydrated or feels oily should choose a lighter lotion. You can also use thicker creams to target only areas of concern, such as your knees, elbows, and heels, without completely coating your body. When it comes to the time of year, the colder the weather, the more likely a thicker lotion will be needed.

As with all generalizations, some specifics should be mentioned. Please note that people with certain skin conditions or sensitive skin should consult with their dermatologist and/or do a skin test of new products before diving right in. You can dab a small portion of the lotion or cream behind your ear for three days in a row before bedtime and watch for reactions when you awaken. This is especially vital for people who suffer from contact dermatitis, which is an allergic reaction to certain chemicals or irritants.

You should also never rub an over-the-counter lotion or cream on split, broken, or rashy skin unless otherwise directed by your doctor. Nearly all types of body lotions and creams contain preservatives, which can cause further irritation. You should stick with an oil-based ointment, such as petroleum jelly, until your skin is healed.