What does PA++ mean in sunscreen?

Q: What does PA++ mean in sunscreen?

PA++ indicates a moderate level of UVA protection. UVA rays are the primary cause of premature skin aging, wrinkles, and freckles (photoaging), unlike SPF which focuses on preventing sunburn. Choosing a sunscreen with PA++ is suitable for those who spend most of their time indoors or are office workers. However, if you are frequently exposed to strong sunlight, we recommend choosing a higher PA++ rating to maintain healthy and youthful-looking skin for longer.

Dr. Apinya Saokaew

No. 49465

First, we need to understand this. Not being exposed to sunlight doesn't mean your skin isn't exposed to sun radiation.

UVA radiation has a wavelength of... 320-400 nanometers Which can penetrate through building windows. 90% Therefore, using PA values is necessary even if the patient is not outdoors.

In short, PA++ means a moderate level of UVA protection. Yes, UVA radiation is the main cause. Premature skin aging, wrinkles, and freckles. (Photoaging) Unlike SPF, which focuses on preventing sunburn, choosing a sunscreen with a high SPF value... PA++ is suitable for people who spend a lot of time indoors or office workers. As a general guideline, but if you'll be exposed to strong sunlight, doctors recommend choosing a higher SPF value to keep your skin healthy and youthful for longer.

This answer provides only preliminary information. Please schedule an appointment with a doctor for a detailed examination and information.

What is PA? Why is there a plus sign (+)?

the word PA (Protection Grade of UVA) This value indicates the effectiveness of the protection. UVA radiation Yes, this type of radiation is very harmful because it can penetrate glass and clouds, constantly damaging the collagen beneath our skin.

UVA = Aging: To make it easy to remember, A stands for Aging. It affects our skin. Wrinkled, sagging, with fine lines and freckles.
Plus sign (+): The more positive values, the longer and better the protection will be. PA++ This means it is effective in protecting against UVA radiation at a certain level. Moderate Protection That's right.

How does PA++ differ from SPF? (A visual comparison)

Many patients get confused between these two values. Let me compare them like this:

SPF (Sun Protection Factor): Like a "firefighting suit" that protects our skin. Sunburn (Protects against UVB radiation)
PA (Protection Grade of UVA): Like a "sun umbrella" that protects our skin. Dark skin or premature aging (Protects against UVA radiation)

A simple example: If a patient applies sunscreen with only a high SPF but no PA rating, their skin might not get red or burned, but when they get home, they will feel that... The complexion becomes dull, or after a while, wrinkles start to appear. Because UVA rays can penetrate and damage the deeper layers of the skin.

Is PA++ sufficient for everyday life?

Office workers: If the patient works in a building and is not exposed to direct sunlight, the cost... PA++ is considered sufficient. To some extent, yes.
Outdoor activity category: But if you have to go to the beach, be in strong sunlight, or drive for long periods, the doctor recommends switching to... PA+++ or PA++++ For maximum protection, please note that a PA++ rating may not be sufficient for the Thai sun.