Sun care,
explained clearly.

SPF Explained: What SPF & PA Ratings Really Mean

Sun protection is more than preventing sunburn — it's an essential part of maintaining healthy, resilient skin. Here's what UVA, UVB, SPF, and PA actually mean, and how to choose the right sunscreen for your lifestyle.

What Does SPF Mean?

SPF stands for Sun Protection Factor. It measures how well a sunscreen protects your skin from UVB rays, which are primarily responsible for sunburn.

Contrary to popular belief, SPF is not a measure of how long you can stay in the sun. Instead, it indicates the level of UVB protection provided when sunscreen is applied correctly and in sufficient quantity.

How Much UVB Does SPF Block?

What Does PA Mean?

While SPF measures protection against UVB rays, the PA rating indicates the level of protection against UVA rays. PA stands for Protection Grade of UVA and is commonly used on sunscreens across Asia.

UVA rays penetrate deeper into the skin and are linked to:

• Premature ageing
• Fine lines and wrinkles
• Hyperpigmentation
• Sun spots
• Skin barrier damage

A sunscreen with a higher PA rating generally provides stronger UVA protection.

Understanding PA Ratings

For everyday wear, choosing a sunscreen with PA+++ or PA++++ provides stronger protection against UVA exposure.

Do You Still Need Sunscreen on Cloudy Days?

Cloudy skies often make the weather feel cooler and less intense, leading many people to wonder if sunscreen is still necessary. After all, if you can't see the sun, can its rays still affect your skin?

The answer is yes.

While thick clouds may reduce the amount of visible sunlight reaching the ground, they don't completely block ultraviolet (UV) radiation. UVA rays, in particular, can penetrate cloud cover and continue to reach your skin, making daily sun protection important even on overcast days.

What About Rainy or Monsoon Days?

Rain doesn't cancel the need for sun protection. During the monsoon, cloud cover may make the weather feel cooler, but UVA rays can still reach your skin. Humidity, sweating, and wiping your face with a towel or tissue may also reduce the amount of sunscreen left on your skin, making reapplication important during extended outdoor activities.

Choosing a Sunscreen for Cloudy and Humid Weather

The best sunscreen is one that you'll wear consistently. When choosing a sunscreen for everyday use, look for:

• Broad-spectrum protection
• SPF 30 or higher
• A lightweight texture suitable for your skin type
• A formula that feels comfortable in humid weather

A sunscreen that's pleasant to wear is more likely to become part of your daily routine.

Sunscreen for Acne-Prone Skin: What to Look For and What to Avoid

If you have acne-prone skin, sunscreen shopping can feel like a minefield. Some formulas leave a greasy film, clog your pores, and set off a fresh round of breakouts. But skipping sunscreen isn't the fix — daily sun protection is one of the most important steps in keeping acne marks from darkening and your skin from further damage.

The real goal is finding a formula that protects without adding to congestion or oiliness.

Why Sunscreen Is Essential for Acne-Prone Skin

A lot of people avoid sunscreen because they think it's the reason for their breakouts. Some formulas can clog pores, yes — but going without sunscreen altogether usually makes things worse, not better.

Daily sunscreen helps:

• Keep acne marks from getting darker
• Calm UV-triggered inflammation
• Protect your skin barrier
• Slow down premature ageing
• Support recovery while you're using acne treatments

If your routine includes salicylic acid, retinol, or benzoyl peroxide, sunscreen isn't optional — these ingredients make your skin more sensitive to the sun.

What to Look for in a Sunscreen for Acne-Prone Skin

Non-comedogenic formula. Look for "non-comedogenic" on the label — it means the formula is designed to lower the risk of clogged pores and breakouts.

Lightweight gel or fluid texture. Heavy creams tend to sit on oily, acne-prone skin like a suffocating layer. Gel and fluid textures absorb faster and leave far less residue.

Oil-free formulation. Oil-free sunscreens cut down on shine and generally feel more comfortable on acne-prone skin, especially in humid weather.

Niacinamide. One of the best ingredients for acne-prone skin — it helps regulate excess sebum, calm redness, strengthen the skin barrier, and fade the look of post-acne marks.

Broad-spectrum SPF 50 or higher. Make sure it covers both UVA and UVB rays. SPF 50 PA+++ or higher is a solid daily standard, especially if you're outdoors often.

Ingredients That May Trigger Breakouts

If your skin breaks out easily, keep an eye out for high levels of:

• Coconut oil
• Cocoa butter
• Isopropyl myristate
• Heavy fragrances
• Overly rich emollients

These aren't a problem for everyone, but they're common culprits behind clogged pores on acne-prone skin.

Ingredients That Work Well for Acne-Prone Skin

Favor sunscreens containing:

• Niacinamide
• Zinc oxide
• Hyaluronic acid
• Green tea extract
• Silica

These support sun protection while also helping control oil and keep skin comfortable.

Pairing sunscreen with a gentle salicylic acid face wash can further help keep pores clear and support acne management.

How to Apply Sunscreen Without Triggering Breakouts

1. Start with a clean face. A gentle cleanser clears away oil, dirt, and sweat before you apply.
2. Keep your routine simple. Skip layering multiple heavy products under sunscreen — if it's hydrating enough, you may not need a separate moisturizer.
3. Use the right amount. About two finger-lengths of product for face and neck gets you the protection stated on the label.
4. Reapply when needed. Every two hours during extended sun exposure, more if you're sweating or swimming.
5. Cleanse thoroughly at night. Sunscreen is built to stay put, so use a proper cleanser at night to prevent it from sitting in your pores overnight.

Common Sunscreen Mistakes People With Acne Make

• Skipping sunscreen entirely — this lets sun exposure worsen acne marks and inflammation.
• Using heavy body sunscreens on the face — body formulas are usually richer and more likely to feel greasy on facial skin.
• Not reapplying — even a great sunscreen loses effectiveness over time, especially outdoors.

The Bottom Line

Acne-prone skin still needs daily sun protection. The best sunscreen for acne-prone skin is non-comedogenic, lightweight, oil-free, and broad-spectrum. Ingredients like niacinamide, PGA, and ceramides add extra benefit by helping control oil, calm inflammation, and support the skin barrier.

With the right sunscreen — like SUNLUMA SPF 50 PA+++ — you can protect your skin from sun damage without triggering unwanted breakouts.