Moles, Tags and Milia — Diagnose Before Removing

Removing a skin lesion is easy. Removing it by destroying it means there is nothing left to examine, and the diagnosis that was never made cannot be made afterwards. This is the whole reason a lesion is identified before a device is switched on, rather than the other way round.

Why The Order Matters

Ablative removal — laser, electrocautery, radiofrequency, cryotherapy — works by destroying tissue in situ. It is quick, it heals well, and it leaves a small flat scar or none at all. What it does not leave is a specimen. The lesion is vaporised or coagulated, and no pathologist can examine what no longer exists.

For the overwhelming majority of lesions this is entirely acceptable, because the overwhelming majority are benign and confidently identifiable on clinical grounds. A pedunculated skin tag in an axilla is a skin tag. A cluster of white papules under the eye is milia. Nobody needs histology to know that, and sending every one of them for examination would be unjustifiable.

The difficulty is the minority, and specifically the pigmented minority. A melanocytic lesion that has changed, or that looks unlike its neighbours, is the one lesion where the specimen carries the information. Destroy it and the patient is left with a healed area, a reassuring conversation, and no diagnosis — and if the lesion recurs at the same site, the recurrence is now harder to interpret than the original was.

Pigmented Lesions — The Ones That Need Assessment

A common acquired melanocytic naevus is symmetrical, uniform in colour, smoothly bordered, generally under six millimetres, and stable over years. It may be flat or raised, and raised naevi on the face are extremely common. Most people carry between ten and forty of them and can confidently ignore every one.

The features that change the approach are well established and worth knowing. Asymmetry of shape or colour. A border that is irregular, notched or fades indistinctly into surrounding skin. More than one colour within the lesion, particularly black, blue-grey, red or white. A diameter above six millimetres. And most importantly evolution — any change in size, shape, colour, surface or symptoms over weeks to months.

Three additional findings prompt assessment regardless of how the lesion scores on those criteria: bleeding without trauma, persistent itch or tenderness, and a pigmented lesion appearing for the first time in an adult over about forty. Any of those, and mole removal becomes a question of excision with histology rather than of cosmetic ablation.

What Dermoscopy Adds And What It Does Not

Dermoscopy uses polarised magnification to see structures below the stratum corneum — pigment network, dots and globules, vascular patterns and structureless areas. In trained hands it substantially improves the accuracy of clinical diagnosis, and it frequently distinguishes a seborrhoeic keratosis from a naevus, or a haemangioma from a pigmented lesion, in a few seconds.

It is an assessment tool and not a verdict. Dermoscopy raises or lowers suspicion; it does not replace histology where suspicion is present. A lesion with concerning dermoscopic features is excised, not photographed and reviewed. A lesion with reassuring features and a concerning history is still excised, because history outweighs appearance.

Where the correct answer is excision with histological examination, the correct referral is to a dermatologist or a surgeon who will perform it properly with adequate margins. That is not a deficiency in an aesthetic practice — it is the appropriate use of one. The lesion that needs a pathologist is not an aesthetic problem regardless of where the patient first raised it.

Skin Tags, Keratoses And Other Benign Lookalikes

Acrochordons — skin tags — are soft, skin-coloured or slightly darker, pedunculated outgrowths favouring the neck, axillae, groin and under the breasts. They are fibroepithelial and entirely benign, they are associated with friction and with insulin resistance, and they are removed for comfort or appearance rather than for risk. Skin tag removal is a snip or a cautery and needs nothing else.

Seborrhoeic keratoses are the most frequently misidentified benign lesion. They are warty, waxy, sharply demarcated and often described as looking stuck onto the skin rather than growing out of it. They can be deeply pigmented and can genuinely resemble a melanocytic lesion, particularly when inflamed or traumatised — which is exactly why a pigmented seborrhoeic keratosis is examined properly before it is ablated.

Sebaceous hyperplasia produces small yellowish umbilicated papules on the forehead and cheeks and is sometimes mistaken for a basal cell carcinoma, which is the more important error in that direction. Sebaceous hyperplasia is benign and recurs because the sebaceous gland remains; a basal cell carcinoma does not behave that way and must not be treated as though it does.

Milia Need Extraction, Tags Do Not

Milia are tiny keratin-filled cysts lying within the epidermis, most often around the eyes and on the cheeks. They present as firm white or cream papules a millimetre or two across, they are not inflammatory, and they do not respond to topical treatment because there is no outlet through which the contents can leave.

The correct treatment is mechanical. The overlying epidermis is incised with a fine sterile needle or blade and the keratin core is expressed. It is a small procedure, it takes moments, and it is definitive for that lesion — milia removal done properly leaves no residual lump because the core has physically gone.

Squeezing them does not work and frequently produces bruising, inflammation and — in melanin-rich skin — post-inflammatory pigmentation that outlasts the milium by months. Neither do exfoliating acids, which thin the overlying skin without evacuating anything. Where milia are numerous or recurrent, the underlying cause is worth examining, because secondary milia follow trauma, occlusive skincare and certain dermatoses.

Lesions That Signal Something Else

Some benign lesions are markers rather than merely blemishes. Xanthelasma — soft yellow plaques at the medial eyelids — are cholesterol deposits, and a substantial proportion of patients with them have a lipid abnormality. Removing them without checking a lipid profile treats the visible part of a finding whose importance lies elsewhere. Xanthelasma recurs readily, particularly where the lipid abnormality is unaddressed.

Multiple skin tags appearing over a short period, particularly with velvety darkening in the axillae or neck, raise the question of insulin resistance. The tags themselves are trivial. The metabolic pattern they accompany is not, and a doctor who removes twenty tags without mentioning it has missed the more useful part of the consultation.

An abrupt eruption of numerous seborrhoeic keratoses is a recognised if rare finding warranting further assessment. These associations are uncommon. They cost nothing to consider, and considering them is part of what separates a medical consultation from a removal service.

How The Consultation Should Run

A full-surface look rather than a look at the lesion the patient pointed to. Patients are reliable reporters of the lesion that bothers them cosmetically and unreliable reporters of the one that matters, particularly on the back, the posterior legs and the scalp. The lesion the patient has not noticed is the one worth finding.

Then identification, lesion by lesion, with dermoscopy where the lesion is pigmented or equivocal. Then a plan that separates what will be ablated from what will be excised with histology and what will be referred. Photography of any lesion being monitored rather than treated, so that a later comparison is against an image rather than a memory.

And finally an honest account of what removal leaves behind. Every method leaves something — a pale mark, a flat scar, a transient pigmented patch that in darker skin can take months to settle. A lesion removed from a cosmetically prominent site trades one visible thing for another, and the patient is entitled to know that before consenting rather than afterwards.