Mole on Palm: When It Needs a Dermatologist

Most people have very few or no moles on their palms. This is partly because acral skin develops fewer melanocytes during embryogenesis and partly because the thick epidermis hides early pigmentation.

When pigmented lesions do appear on palms, the differential includes:

Benign acral nevus. Stable, well-defined, often present since childhood. Not common but possible.

Blood blister or bruise from trauma. Resolves in 1-2 weeks.

Wart with thrombosed capillaries. Has the typical wart appearance plus dark pinpoint vessels.

Fungal pigmentation. Usually with scaling or itching.

Acral lentiginous melanoma. The serious concern. Looks like a flat or slightly raised pigmented patch with irregular borders, often multi-coloured.

The statistical reality: a new pigmented lesion on the palm has higher prior probability of being ALM than the same lesion on more typical mole sites (chest, back, arms). This is reason for lower threshold for evaluation, not panic.

Dermoscopy of palm pigmentation distinguishes two patterns:

Parallel furrow pattern: pigment in the grooves between ridges. Benign nevus.

Parallel ridge pattern: pigment on the ridges themselves. Strong indicator of acral melanoma — about 86% sensitive, 99% specific when present.

The pattern can sometimes be seen with the naked eye under good lighting. For most patients, dermoscopy by a dermatologist is the reliable way to assess. A 5-minute dermatology examination with a dermatoscope confidently distinguishes most benign from concerning palm lesions.

Within 2-4 weeks if any:

New palm pigmented lesion in the past 6-12 months.

Any pigmented lesion on the palm in someone with no previous palm moles.

Growing palm pigmented lesion.

Irregular borders or multiple colours.

Diameter over 6mm.

Within 1-2 weeks if any:

Dark spot on palm that has not resolved in 4-6 weeks (beyond bruise/blister timeline).

Lesion with parallel ridge pattern visible to naked eye.

Ulceration or bleeding.

Personal history of melanoma.

Lesion in someone of Asian, Black, or Hispanic ancestry (higher prior probability of ALM).

For any persistent palm pigmented lesion regardless of ancestry, dermatology evaluation with dermoscopy is the right action.

Hyperpigmentation from healed blisters: post-inflammatory pigmentation after a friction blister or popped vesicle. Usually fades over months.

Dermatographic marks: scratch marks that produce temporary darker lines. Resolve in days.

Fungal pigmentation: tinea manuum or other fungal infections. Often itchy or scaly.

Warts: have characteristic verrucous surface and pinpoint vessels.

Freckles or solar lentigines: rare on palms but possible. Stable.

Iron deposits from frequent contact with iron objects (rare): faint grey-brown discolouration.

The distinction matters for triage. A clearly post-inflammatory mark from a healed blister is not the same clinical concern as a new pigmented patch with irregular features. The latter needs evaluation; the former does not.

Palms are easy to see directly, which is an advantage. Monthly self-exam:

Look at both palms under good lighting. Compare to your previous appearance — most people have an essentially blank palm with no moles.

Note any pigmented spots. Photograph with a coin for scale.

If a pigmented lesion is present and stable for years, it's likely a benign acral nevus. Continue monitoring.

If new, growing, or with any irregular features, evaluate.

For people in higher-risk groups (Asian, Black, Hispanic; prior melanoma; family history), 6-monthly dermatologist examination of palms, soles, and nails is reasonable.

For general population, palm checks during routine skin self-exam are sufficient.

The clinical message is simple:

A new pigmented palm lesion in adulthood is uncommon and worth dermatology evaluation.

A stable lesion present since childhood is usually a benign acral nevus and can be monitored.

Any lesion that grows, changes, ulcerates, bleeds, or has irregular features warrants evaluation within 2-4 weeks.

In higher-risk groups, threshold for evaluation is lower.

Dermatology examination with dermoscopy resolves most cases without biopsy. When biopsy is needed, it's a small punch or shave under local anaesthetic. Pathology distinguishes benign from malignant reliably.

For mucinous or watery discharge, ulceration, or any pigmented streak under a nail extending from the palm region, an urgent evaluation (1-2 weeks) is appropriate. These features point toward more advanced disease and should not wait.