When to use salicylic acid: morning or night

People ask two timing questions about salicylic acid: morning or night, and how often. The FDA's label directions answer the second one in numbers, and they leave the first one open. This guide covers both, plus the times you should skip salicylic acid or stop it. For the steps of applying it, see how to use salicylic acid on your face. For what it does, see the hub guide, what salicylic acid does for your skin.

Morning or night

No guideline or label that Skinli checked says salicylic acid works better at one time of day. The FDA's required directions for leave-on acne products say to "cover the entire affected area with a thin layer one to three times daily." They name no time.

So choose the time that fits your routine and your skin. A few facts from the sources help:

• The AAD gives one example schedule. Its page on large pores says that if a salicylic acid cleanser dries or irritates your skin, "Use a mild, non-comedogenic cleanser when you wake up and the salicylic acid cleanser before bed." Non-comedogenic means made not to clog pores.
• Morning use needs sunscreen. The FDA says: "Use sun protection if you use a BHA product." Salicylic acid is the most common BHA. In a 2009 study in the Journal of Dermatological Science, 2 percent salicylic acid used for 3.5 weeks did not raise redness or sunburn cells after light exposure, while 10 percent glycolic acid did. The FDA's advice still stands, and sunscreen belongs in any acne routine.
• Night keeps it apart from morning make-up and sunscreen, which makes one daily use at night a simple plan.

If you use other products with active ingredients in the morning, such as vitamin C, check Skinli's guide to which skincare ingredients you can mix before you add salicylic acid to the same routine.

How often

The FDA directions set out a clear path:

1. "start with one application daily"
2. "then gradually increase to two or three times daily if needed or as directed by a doctor"
3. "if bothersome dryness or peeling occurs, reduce application to once a day or every other day"

MedlinePlus says topical salicylic acid "may be used as often as several times a day or as infrequently as several times a week, depending on the condition being treated and the product being used." For acne, it says your skin may become dry or irritated at first, so "you may apply the product less often at first, and then gradually begin to apply the product more often after your skin has adjusted to the medication."

Skinli's suggested starting plan, kept within those two sources:

Your skin	Start	After 2 weeks with no dryness
Oily, not sensitive	Once a day	Stay at once a day, or twice if needed
Normal or combination	Once a day	Stay at once a day
Dry or stings easily	Every other day, or a few times a week	Once a day if comfortable

"If needed" matters. The FDA directions give the reason for starting at once a day: "excessive drying of the skin may occur." Each extra application adds to that drying.

Two sample weeks

These examples follow the FDA directions and the MedlinePlus advice to start less often if your skin is dry or sensitive. They are Skinli's suggestions, and your product's own label comes first.

Plan A: oily or normal skin, leave-on gel

Days	Morning	Night
Every day, weeks 1 to 8	Gentle cleanser, moisturizer, sunscreen	Gentle cleanser, thin layer of salicylic acid gel, moisturizer

Plan B: dry or sensitive skin, salicylic acid cleanser

Days	Morning	Night
Monday, Wednesday, Friday, weeks 1 and 2	Gentle cleanser, moisturizer, sunscreen	Salicylic acid cleanser, moisturizer
Other nights, weeks 1 and 2	Gentle cleanser, moisturizer, sunscreen	Gentle cleanser, moisturizer
Every night from week 3, if comfortable	Gentle cleanser, moisturizer, sunscreen	Salicylic acid cleanser, moisturizer

If dryness or peeling starts at any point, go back one step. The AAD lists salicylic acid among acne treatments that "tend to dry and irritate the skin" and says a daily moisturizer helps skin tolerate them, which is why moisturizer appears in every row.

Timing around sweat and exercise

The AAD's face washing page says to wash "once in the morning and once at night, as well as after sweating heavily," and to wash "as soon as possible after sweating." If you exercise in the evening, the wash after exercise can be your night wash, followed by your salicylic acid product.

For acne on the body caused by sports gear that traps heat and sweat, the AAD says "Using an acne medication with salicylic acid often works well to clear this type of acne." A salicylic acid body wash in the shower after exercise fits that advice. If the acne is still there after 6 to 8 weeks, the AAD says a dermatologist can help.

Washes versus leave-on products

A salicylic acid cleanser follows its own label, because the FDA lets rinse-off products write their own directions. The AAD says to limit face washing to twice a day and after sweating, and that some salicylic acid cleansers "are gentle enough to use every day."

Counting matters when you use more than one salicylic acid product. A salicylic acid wash in the morning and a salicylic acid gel at night is two applications of the same medicine. Keep to one product if you can. The guide what order to apply your acne products shows where each step goes, morning and night.

Every day, and for how long

Daily use is within the label. The questions are whether your skin tolerates it and whether the product is helping.

For tolerance, watch for tightness, flaking or stinging that lasts. MedlinePlus says to tell your doctor if skin irritation or stinging is severe or does not go away, and the FDA directions say to cut back if dryness or peeling bothers you.

For results, give it time. The guide how long does an acne routine take to work explains why skin changes slowly. The AAD says: "You want to use a product for 6 to 8 weeks. It takes that long to see some improvement." Complete clearing "generally takes 3 to 4 months." MedlinePlus warns that your skin may look worse in the first few days. The guide can salicylic acid cause breakouts explains that stage.

After acne clears, the AAD says to keep using the treatment: "Even when you see clearing, you'll want to keep using the acne treatment. This helps to prevent new breakouts."

If you miss a day

MedlinePlus gives a rule for missed doses of topical salicylic acid: "Apply the missed dose as soon as you remember it. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. Do not apply extra topical salicylic acid to make up for a missed dose." For a once-a-day night product, that means you use it the next night as usual.

When to skip a day

Skip salicylic acid on any day your skin is:

• Broken or raw. MedlinePlus says not to apply it to skin that is "broken, red, swollen, irritated, or infected." That includes a pimple you picked, a cut from shaving, or sunburned skin.
• Peeling or stinging from the day before. The FDA directions say to reduce to once a day or every other day.

When to stop or ask first

• Children and teenagers with chickenpox or flu. MedlinePlus says they "should not use topical salicylic acid unless they have been told to do so by a doctor" because of the risk of Reye's syndrome, a rare and serious illness.
• Pregnancy. MedlinePlus says to tell your doctor if you are pregnant or plan to be. See salicylic acid during pregnancy.
• Another acne medicine on the same skin. The FDA requires every acne product to warn that irritation and dryness are more likely with a second one. Skinli's photo plan asks you to stop salicylic acid while you use its adapalene and benzoyl peroxide gels.
• Signs of an allergy or of too much medicine. Stop and get emergency help for hives, throat tightness, trouble breathing, feeling faint, or swelling of the face, lips or tongue. Call a doctor for confusion, dizziness, ringing in the ears, fast breathing, nausea or vomiting. MedlinePlus lists both groups.

When to see a doctor instead

If you have used salicylic acid on schedule for 6 to 8 weeks and see no change, the AAD suggests trying a product that works on a different cause of acne, and seeing a dermatologist if acne has not cleared with over-the-counter treatment. See a doctor sooner for deep, painful lumps, acne that leaves scars, or skin that gets worse week after week.