Author

Callum Hartmann Page 3

Callum Hartmann is a senior writer at Biology Insights specializing in dermatological health. Living in Tacoma, Washington, he applies scientific training to explain surface symptoms affecting the skin, nails, and lips. Hartmann worked on a fashion magazine copy desk and studied science journalism, having received a bachelor’s degree in communications.

Why Do My Lips Get White Stuff on Them?Skin & Hair
Why Does My Toenail Look Bruised? Reasons & When to Worry Skin & Hair
Dry Patch on Your Eyelid: Causes and Treatments Skin & Hair
Black Line on Your Nail: Harmless or Melanoma?Cancer
What Does Red Man Syndrome Look Like?Skin & Hair
Why Does the Side of My Mouth Crack? Causes & Fixes Skin & Hair
Why Are My Lips Bigger When I Wake Up?Skin & Hair
What Does It Mean When You Get a Bump on Your Lip?Skin & Hair
How to Treat a Swollen Lip From a Pimple Skin & Hair
Black Line on Nail: Harmless or a Cancer Sign?Skin & Hair
How Stress Affects Your Skin, Hair, and Nails Skin & Hair
Black Lines on Nails: Causes and When to Worry Skin & Hair
Why Are My Lips So Dry? Common Causes and Fixes Skin & Hair
How to Treat Swollen Lips: Causes and Home Remedies Skin & Hair
How to Fix Dry Eyelids: Causes and Treatments Skin & Hair
What Do Blue Nails Mean? Causes and When to Worry Skin & Hair
Is Geographic Tongue Contagious? Causes & Symptoms Dental
What Are Spoon Nails? Signs, Causes, and Treatment Skin & Hair
Is Geographic Tongue Painful? Symptoms and Triggers Dental
What Causes Cracked Lips and How to Heal Them Skin & Hair
How to Get a Pink Tongue: Causes and Simple Fixes Gut & Kidney
What Is a Big Forehead a Sign Of Medically?Brain & Nerves
How to Get Rid of a Black Spot on Your Lip Skin & Hair
How to Heal Cracked Lip Corners Fast at Home Skin & Hair
Why Do My Lips Keep Peeling Even When I Wear Chapstick?Skin & Hair
How to Get Rid of White Dots on Lips Skin & Hair
Why Do I Have White Hair at 12?Skin & Hair
Is Lichen Striatus Dangerous? What You Need to Know Skin & Hair
Why Do I Have a Dry Spot on My Lip?Skin & Hair
Why Are My Lips Small? Genetics, Structure, and Age Genetics