Dr. Zain, Heather, and Courtney break down why nails matter in dermatology, covering basic nail anatomy, slow toenail growth, and how trauma can change nails. They review common nail findings (ridges, Beau’s lines, pitting, thickened nails, habit-tic damage), brittle/splitting nails, and color changes including yellowing, white spots, green nail (Pseudomonas), and brown streaks (melanonychia) with red flags for melanoma and when biopsy may be needed. The episode also covers nail infections (fungal, bacterial paronychia, HPV warts), treatment options and timelines, nail salon safety (tool cleaning, UV lamp sunscreen, avoiding over-trimming cuticles), common myths, and when to see a dermatologist—especially for new or changing pigment or symptoms like pain, bleeding, or lifting.

00:00 Gross Toenail Talk: Socks Off = Crime Scene

00:55 Welcome to Skin Side Out: Why Dermatologists Care About Nails

02:10 Nail 101: Anatomy, Matrix Biopsies & Why Nails Change Slowly

03:18 Growth Rates & Trauma Clues (Toenails Take Forever)

04:34 Texture Changes: Ridges, Beau’s Lines, Pitting & Inflammation

08:34 Thick, Curved “Ram’s Horn” Nails vs Fungus Myths

09:34 Habit-Tic Deformity: Nail Picking, Biting & Permanent Damage

12:52 Brittle & Splitting Nails: Onycholysis, Peeling, Lichen Planus + Causes

15:06 Supplements & Medical Causes: Water, Acetone, Thyroid + Biotin

16:40 Nail Color Changes: Yellow, White Spots & When to Worry

17:48 Brown Streaks (Melanonychia) vs Bruising: Hutchinson Sign & Biopsy Decisions

21:19 Green Nail Syndrome: Pseudomonas from Nail Enhancements

22:07 Green Nail Syndrome & Where Pseudomonas Hides

23:09 Fungal Toenail Infections: Causes, Contagion & Why OTC Fails

24:39 Treating Nail Fungus: Orals, Rx Topicals, Home Remedies & Lasers

26:12 When Fungus Gets Gross: Thick Nails, Spreading & Podiatry Help

28:17 Bacterial Nail Infections: Paronychia, Triggers & Painful Drainage

30:07 Viral Nail Problems: HPV Warts Around (and Under) the Nail

31:39 Nail Salon Safety 101: Tools, UV Lamps, Breaks & Cuticle Care

35:29 Rapid-Fire Nail Myths (Biotin, “Breathing,” White Spots & More)

37:53 When to See a Dermatologist + Final Nail Care Tips