From SPF misconceptions to missed spots, experts explain what to watch out for.
Dubai: Sunscreen is something many people believe they are using correctly—applied in the morning, offering a sense of protection for the day ahead. However, according to dermatologists, there is a significant gap between how sunscreen is perceived and how it actually works, especially in the UAE’s high-UV environment, where the consequences of incorrect use can be substantial.
Here is what two specialists want you to know.
How much sunscreen you actually need
One of the most common mistakes is under-application, with most people using far less than the amount required for effective protection.
Dr. Rehna Ahamed PK, Specialist Dermatologist at Aster Clinic Al Nahda Dubai, recommends the “two-finger method” for the face and neck. She advises applying sunscreen generously using two finger units—the index and middle fingers—for adequate coverage of the face and neck.
For full-body protection, she recommends around 30–35 ml, roughly equivalent to a shot glass. She also cautions against missing commonly overlooked areas such as the back of the ears, the neck, and the upper legs.
Even a high-SPF sunscreen may fail to deliver the expected level of protection if it is applied too thinly, says Dr. Radha Nilesh Patil, Specialist Dermatologist at Medcare Royal Speciality Hospital Dubai.
For children, Dr. Rehna recommends a mineral sunscreen containing zinc oxide or titanium dioxide, applied in a quantity of about 15–17 ml, roughly half a shot glass. “Mineral sunscreen sits on the skin and forms a protective barrier,” she explains.
Dr. Radha Nilesh Patil, Specialist Dermatologist at Medcare Royal Speciality Hospital Dubai, reinforces that even high-SPF sunscreens may not provide adequate protection if applied too thinly. She recommends applying sunscreen about 30 minutes before sun exposure, noting that an effective habit is to apply it immediately after showering, allowing enough time for absorption before heading outdoors.
SPF 30 or SPF 50: does it matter?
The difference is minimal, but correct usage matters more than the number itself.
“SPF 30 blocks around 97% of UVB rays, while SPF 50 blocks about 98%,” says Dr. Rehna. “In the UAE’s high-UV environment, I generally recommend a broad-spectrum SPF 50 for daily use, especially for people who spend long hours outdoors, have sensitive skin, pigmentation concerns, or a history of skin cancer.”
Dr. Radha agrees but places equal emphasis on habits over SPF values. “Consistent application and reapplication often have a greater impact than the SPF number alone,” she says.
As a general guideline, SPF 30 should be reapplied every two to three hours, while SPF 50 may extend protection slightly to about three to four hours. However, both doctors stress that factors such as sweating, swimming, and physical activity significantly reduce this window regardless of SPF level.
The most common sunscreen mistakes
Both specialists highlight a similar set of frequent errors:
- Applying too little sunscreen
- Applying once and assuming it lasts all day
- Forgetting to reapply after sweating or outdoor activity
- Relying on makeup with SPF as a replacement
- Assuming darker skin tones do not require sun protection
- Believing sunscreen is only necessary at the beach
“Many people associate sunscreen with beach visits or outdoor recreation,” says Dr. Radha. “Yet significant UV exposure can occur during everyday activities such as commuting, exercising, dining outdoors, or simply going about daily routines.”
The spots you are almost certainly missing
Both dermatologists highlight several commonly overlooked areas when applying sunscreen, including the ears, eyelids, lips, back of the neck, scalp and hairline, hands and feet, as well as under the chin and along the sides of the face and jawline.
Dr. Rehna Ahamed PK, Specialist Dermatologist at Aster Clinic Al Nahda Dubai, recommends applying sunscreen generously using the “two-finger rule”—using the index and middle fingers—to ensure adequate coverage of the face and neck.
“Over time, repeated UV exposure to these areas can contribute to premature skin ageing, hyperpigmentation, melasma, fine lines, sunspots, and an increased risk of precancerous skin lesions,” says Dr. Rehna. “In a high-UV region, cumulative sun damage can occur even during routine activities such as driving, walking between buildings, or commuting outdoors.”
What about cloudy days and being indoors?
Sunscreen should not be skipped in either case. “Up to 80% of UV rays can penetrate clouds, meaning skin damage can still occur on overcast days,” says Dr. Rehna. “UVA rays can also pass through glass windows, contributing to ageing, pigmentation, and long-term skin damage.”
Dr. Radha adds that sunscreen is not just a beach-day essential. “The best approach combines sunscreen with practical measures such as seeking shade, wearing sunglasses, choosing protective clothing, using a wide-brimmed hat, and limiting exposure during peak sunlight hours. Small daily habits can make a meaningful difference to long-term skin health.”
