Author

Callum Hartmann Page 2

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.

What Does a Black Spot on the Lower Lip Mean?Skin & Hair
Why Are My Lips Turning Black? Causes & Concerns Skin & Hair
How to Treat Cracks in the Corner of Your Mouth Skin & Hair
Why Do My Lips Feel Cold? Causes and When to Worry Skin & Hair
Poliosis Eyelashes: Causes, Appearance, and Treatment Skin & Hair
Why Are My Cheeks So Hot? Causes and What to Do Skin & Hair
How to Get Rid of a Mucous Cyst on Lip Skin & Hair
Why Is the Skin on My Big Toe Dark?Skin & Hair
Does the UV Light for Nails Cause Cancer?Cancer
Why Does My Upper Lip Stink? Causes and What to Do Skin & Hair
What Is the White Film on My Lips?Skin & Hair
Why Are My Lips Dry Even With Chapstick?Skin & Hair
Why Is My Lip Bruised? Common Causes and What to Do About It Bones & Muscles
Why Do My Lips Keep Peeling? Causes and Relief Skin & Hair
Why Is My Eyelid Purple? Causes and When to Worry Eyes & ENT
What Does Vitamin D Deficiency Look Like in Nails?Skin & Hair
Why Are My Cuticles Dark? Causes and When to Worry Skin & Hair
Why Do My Lips Taste Salty? Potential Causes to Know Skin & Hair
Why Is There a Bump Under My Nail? Causes and Concerns Skin & Hair
Why Do My Lips Peel Everyday? Causes and Prevention Skin & Hair
How to Get Rid of a Venous Lake on Your Lip Skin & Hair
Why Are My Eyelids a Different Color?Skin & Hair
My Lips Are Discolored: What It Means for Your Health Skin & Hair
Why Do I Have a White Line Around My Lips?Skin & Hair
What Drugs Can Make Your Skin Darker?Drugs
Why Do My Ankles Look Bruised?Skin & Hair
Why Is the Skin Around My Nails Dark?Skin & Hair
Why Do My Lips Feel Sticky? Causes and Relief Skin & Hair
Smoker’s Tongue: Symptoms, Causes, and Treatment Dental
What Makes Your Lips Tingle and When to Worry Skin & Hair