Self-Care · Skincare

KNOWLEDGE HUB

Ingredient reference, compatibility checker, and application rules. HSA/FSA notes and where to buy at Ulta and Walgreens. Tan to deep skin tone focus.

HSA / FSA eligibility note: Eligibility is determined by the IRS and your specific plan administrator, rules can change at any time. The guidance below is based on current IRS Publication 969 and CARES Act rules. Always confirm with your plan before purchasing. Products that treat a diagnosed medical condition (acne, rosacea, eczema) are more likely to qualify than those used for cosmetic purposes only. A Letter of Medical Necessity from a dermatologist can unlock eligibility for borderline products.

Pick up to 3 actives to layer

Tap up to three. If picking a fourth, the oldest pick drops off. Covers the 11 most commonly combined actives.

AM vs PM, what goes when

Morning (AM)

Gentle non-active cleanser

Vitamin C serum (before SPF, boosts ultraviolet protection)

Niacinamide (AM or PM)

Tranexamic acid (AM or PM)

Azelaic acid (AM or PM, photostable)

Hyaluronic acid serum (on damp skin)

Ceramide moisturizer (seal within 60 sec)

Benzoyl peroxide, spot treatment only

SPF 30+, always the final AM step

Night (PM)

Gentle cleanser (double cleanse if SPF was worn)

Retinol or tretinoin (PM only, light degrades it)

Salicylic acid, on non-retinol nights only

Glycolic or lactic acid, on non-retinol nights only

Peptides (separate step from acids)

Centella asiatica, anytime skin needs calming

Squalane, seals in whatever was applied before it

Ceramide moisturizer, always the final PM step

Rules that hold regardless of routine

Never do these

—Two exfoliating acids on the same night

—Retinol on damp skin, always fully dry first

—Hyaluronic acid without sealing immediately with moisturizer

—Adding a new active while skin is flaring or the barrier is damaged

Always do these

—SPF every morning, including indoors near windows

—Introduce one new active at a time, wait 2 to 4 weeks

—Patch test any new product on the inner arm for 24 to 48 hours

—Start retinol every 3rd night and build slowly over months

—Seal hyaluronic acid within 60 seconds with ceramide cream

—Wait for skin to be fully dry before applying retinol

—Return to barrier repair any time skin flakes or burns

Specific notes for tan to deep skin tones

Post-inflammatory hyperpigmentation is more stubborn on deeper skin tones

More melanin is produced in response to any skin injury. Dark marks form more easily and take longer to fade. Consistent SPF is the single most important factor. Best ingredients: niacinamide, tranexamic acid, azelaic acid, alpha arbutin. Mandelic acid is the safest AHA, largest molecule, slowest penetration, lowest hyperpigmentation trigger risk.

Avoid on deeper skin tones without medical supervision

High-concentration glycolic acid above 10% can trigger rebound hyperpigmentation if overused. High-strength hydroquinone used long-term can cause paradoxical darkening. Physical scrubs and high-friction tools cause trauma that leads to new dark spots.

Best ingredients specifically for tan to deep skin tones

Niacinamide 5%, tranexamic acid, azelaic acid 10 to 15%, mandelic acid, alpha arbutin, vitamin C in stable forms (ascorbyl glucoside, magnesium ascorbyl phosphate), and SPF every single day.

When to stop actives and return to barrier repair

⚠Skin is burning, stinging, or raw, stop all actives immediately

⚠Visible peeling or flaking that does not resolve within a few days

⚠Dark spots that appear to be getting darker rather than fading

⚠Starting a new prescription that affects skin (antibiotics, hormonal changes)

⚠Before and after any in-office treatment (chemical peel, laser, microneedling)

⚠When unsure if a reaction is purging vs irritation, when in doubt, pause