Sources starting with D

• Dear, Klairs Supple Preparation Unscented Toner — Official Product Page

  The Dear, Klairs Supple Preparation Unscented Toner page documents toner category fit, formula ingredients, and hydrating-use directions.

• Decker 2012 — Over-the-counter acne treatments

  Peer-reviewed OTC acne treatment review used for salicylic acid product and tolerance context.

• Dermagist Collastin — Official Product Page

  Official product page used for Dermagist Collastin formula facts, positioning, and price checks.

• Dermagist Dynamic Age Defying Serum — Official Product Page

  Dermagist product page for Dynamic Age Defying Serum, including price, 2-jar offer, Matrixyl, Renovage, Hyaluronic Acid, and pore-positioning copy.

• Dermagist Neck Restoration Cream — Official Product Page

  The official Dermagist product page lists Neck Restoration Cream as a neck-area product for sagging-looking, crepey, loose, and lined neck skin.

• Dermagist Original Wrinkle Smoothing Cream — Official Product Page

  Official product page used for formula facts, positioning, and price checks.

• Dermatologists' top tips for relieving dry skin

  AAD guidance on relieving dry skin with practical bathing, cleansing, moisturizer timing, and clinician-punt advice.

• DermNet — Acne

  DermNet acne reference used only for acne as the trigger context behind later dark marks.

• DermNet — Acne vulgaris

  DermNet acne vulgaris guidance supports acne lesion terminology, clogged pores, inflammatory-looking blemishes, nodules, cysts, and scarring boundaries.

• DermNet — Adult acne

  DermNet adult-acne guidance covers adult-onset acne patterns, contributors, hormonal context, lesion types, and referral-worthy presentations.

• DermNet — Alpha hydroxy acid facial treatments

  DermNet guidance on AHA facial treatments, used for AHA mechanism, tolerance, and facial exfoliation context.

• DermNet — Azelaic acid

  DermNet azelaic acid reference supporting use context, pigment discussion, and tolerability cautions.

• DermNet — Flushing

  DermNet flushing guidance explains transient flushing triggers and helps distinguish temporary red-looking skin from persistent medical patterns.

• DermNet — Irritant contact dermatitis

  DermNet reference on irritant contact dermatitis.

• DermNet — Melasma

  DermNet reference on facial pigmentation, sun exposure, and pigment-related terminology.

• DermNet NZ — Comedo

  Dermatology reference defining comedones, including open comedones commonly called blackheads.

• DermNet NZ — Cosmeceuticals

  A clinical reference page from DermNet NZ that explains the cosmeceutical category — leave-on skincare ingredients positioned between cosmetics and pharmaceuticals.

• DermNet NZ — Periorbital puffiness

  DermNet reference used for periorbital puffiness mechanisms and differential-cause framing.

• DermNet NZ — Salicylic acid

  Dermatology reference for salicylic acid as a beta-hydroxy acid used in comedone-prone skin.

• DermNet NZ — Topical retinoids

  Dermatology reference for topical retinoids including adapalene and expected irritation during onboarding.

• DermNet — Postinflammatory hyperpigmentation

  DermNet reference defining PIH and explaining why inflammation can leave pigment behind.

• DermNet — Rosacea

  DermNet rosacea guidance supports the medical-boundary section for persistent flushing, bumps, burning, and redness beyond cosmetic skincare.

• DermNet — Sensitive skin

  DermNet explains sensitive skin as stinging, burning, tightness, or discomfort triggered by products, environment, or underlying skin vulnerability.

• DermNet — Skin ageing

  DermNet explains intrinsic and extrinsic skin ageing, including UV-related visible changes such as wrinkling, texture change, and uneven tone.

• DermNet — Sun Protection

  DermNet explains practical sun-protection behavior, including sunscreen, shade, protective clothing, and reducing UV exposure.

• DermNet — Tranexamic acid

  DermNet tranexamic acid reference supporting cautious pigmentation-related discussion.

• Dermstore Product Page — SkinCeuticals C E Ferulic

  The Dermstore SkinCeuticals C E Ferulic page documents price, key ingredients, positioning, and formula details for this vitamin C serum.

• Dhaliwal 2019 — topical bakuchiol and retinol for facial photoageing
• Differin — Official Differin Gel product page

  The official Differin product page for Differin Gel, the brand's adapalene 0.1% leave-on gel.

• Diffey 2001 — When Should Sunscreen Be Reapplied?

  A peer-reviewed analysis by Brian Diffey published in the Journal of the American Academy of Dermatology in 2001 examining sunscreen reapplication timing under realistic-use conditions.

• Ditre 1996 — Glycolic acid and L-lactic acid creams

  Peer-reviewed AHA facial-use trial used for glycolic and lactic acid context and tolerability framing.

• Dry skin: Who gets and causes

  AAD overview of common dry-skin causes and risk factors.

• Dry Skin (Xeroderma): Causes, Treatments, and More - DermNet

  DermNet dry-skin reference covering xeroderma, barrier factors, symptoms, and care boundaries.

• Dry Skin (Xeroderma): Symptoms, Causes, Treatment & Prevention

  Cleveland Clinic patient guidance on dry skin, common symptoms, causes, and when to seek medical care.