The Simple Test Dermatologists Use to Identify Suspicious Skin Growths

Health Points

• Skin tags and moles differ in texture, color, and attachment—knowing these distinctions helps identify when to seek medical attention
• Moles that change shape, color, or size warrant immediate dermatologist evaluation using the ABCDE screening method
• Simple at-home observation can distinguish harmless growths from those requiring professional assessment

Noticing new spots or bumps on your skin can trigger worry, but understanding what you’re looking at makes all the difference. Two of the most common skin growths—moles and skin tags—often get confused, yet they have distinct characteristics that even untrained eyes can learn to recognize.

“The good news is that both skin tags and moles are typically benign,” explains Dr. Jennifer Martin, a board-certified dermatologist at New York Dermatology Group. “But knowing which is which helps you monitor your skin health effectively.”

Understanding Skin Tags

Skin tags are small, soft pieces of hanging skin that appear most commonly in areas where skin rubs against skin or clothing. These flesh-colored or slightly darker growths typically measure just a few millimeters across and feel smooth to the touch.

They develop most frequently on the neck, underarms, eyelids, and groin. Middle-aged and older adults see them more often, though they can appear at any age.

“Think of skin tags as excess tissue that forms where friction occurs,” says Dr. Robert Chen, a dermatologist practicing in Arizona. “They’re completely harmless, though some people find them cosmetically bothersome.”

The growths have a distinctive pedunculated appearance—meaning they hang from the skin by a narrow stalk or stem. This attachment point makes them easy to distinguish from moles, which sit flat against or slightly raised from the skin surface without that telltale stalk.

Recognizing Moles

Moles, medically known as nevi, form when pigment cells grow in clusters. They appear as brown, tan, black, red, pink, or skin-colored spots that can be flat or raised.

Most people develop between 10 and 40 moles throughout their lifetime, with the majority appearing before age 30. These growths typically have even coloring and symmetrical borders, though normal variations exist.

“A healthy mole maintains consistent characteristics over time,” notes Dr. Martin. “It’s when you see changes that attention becomes necessary.”

Unlike skin tags, moles don’t have that hanging, stalk-like attachment. They’re firmly connected to the skin and won’t move when touched the same way a skin tag might wiggle on its stem.

The ABCDE Method for Mole Evaluation

Dermatologists recommend the ABCDE system for monitoring moles. This acronym stands for Asymmetry, Border irregularity, Color variation, Diameter larger than a pencil eraser, and Evolution or change over time.

Asymmetrical moles where one half doesn’t match the other deserve professional evaluation. Borders should be smooth and well-defined rather than ragged or blurred.

“Multiple colors within a single mole—browns, blacks, reds, whites, or blues—can signal concern,” Dr. Chen explains. “And any mole that changes in size, shape, or color needs examination.”

The diameter guideline suggests extra caution for growths exceeding 6 millimeters, though melanomas can be smaller. Evolution remains perhaps the most important factor—any changing mole warrants a dermatologist visit.

When Professional Evaluation Matters

While skin tags rarely require medical attention unless they become irritated or caught on clothing, moles need more vigilant monitoring. Any growth that bleeds, itches, or becomes painful should be checked promptly.

Family history of skin cancer increases the importance of regular skin examinations. People with fair skin, significant sun exposure history, or numerous moles face higher melanoma risk.

“I tell patients to photograph concerning spots with their phone,” says Dr. Martin. “This creates a baseline for tracking changes over time.”

Annual full-body skin checks with a dermatologist provide the most comprehensive protection. These examinations can identify problematic growths before they become serious health threats.

Treatment Options

Skin tag removal is straightforward when desired for cosmetic reasons or if the growth becomes irritated. Dermatologists can snip them off, freeze them with liquid nitrogen, or cauterize them in quick office procedures.

“Never attempt to remove skin tags at home with scissors or dental floss,” warns Dr. Chen. “This risks infection and scarring.”

Mole removal depends on the growth’s characteristics. Suspicious moles are excised and sent for biopsy to rule out cancer.

Cosmetic mole removal is also possible, though insurance typically won’t cover procedures done purely for appearance. The process involves numbing the area and either shaving the mole flat or cutting it out with a small margin of surrounding tissue.

Prevention and Protection

While you can’t prevent skin tags or normal moles entirely, sun protection reduces melanoma risk and limits new mole development. Daily broad-spectrum sunscreen with SPF 30 or higher provides essential defense.

Protective clothing, wide-brimmed hats, and seeking shade during peak sun hours add extra layers of safety. Avoiding tanning beds eliminates a significant source of harmful UV exposure.

“The skin care habits you establish now pay dividends for decades,” notes Dr. Martin. “Think of sun protection as a daily, non-negotiable routine like brushing your teeth.”

Regular self-examination helps catch changes early. Use a full-length mirror and handheld mirror to check hard-to-see areas, or ask a family member to help inspect your back and scalp.

Understanding the difference between skin tags and moles empowers you to make informed decisions about your skin health. While most growths prove harmless, knowing when to seek professional evaluation can literally save your life.