Is a sunscreen with an SPF of 30 really no better than one with an SPF of 15? Do sunscreens prevent...or cause skin cancer? What exactly does SPF really mean? Despite how ubiquitous sunscreens are, studies have shown that many of us actually know very little about the lotions we put on to protect us from the sun. The following are some of the more common sunscreen "myths" I encounter, along with my attempt to clarify what it is that the science tells us.Read More
Toronto Dermatologist Dr. Michelle Levy’s dermatology blog.
I sometimes hear from my patients that they have trouble finding a sunscreen that doesn't cause them to develop acne. Thankfully, there are a plethora of sun-care choices today, including many options for people with acne-prone skin. The following are steps you can take to find a sunscreen that does not cause you to breakout:Read More
SPF stands for Sun Protection Factor. It is primarily a measurement of the protection a sunscreen provides against ultraviolet B (UVB) radiation. An SPF is the ratio between the time it takes for the skin to redden or sunburn to start (known as the MED or minimal erythema dose) in skin protected with sunscreen and the MED in unprotected skin. For example, if it takes 20 minutes to develop redness without sunscreen, a sunscreen with an SPF of 15 might prevent reddening for 15 times as long...about 5 hours.Read More