Most people treat skin as a surface — something to cleanse, cover and correct. Biologically it is a readout of what is happening underneath.
When a skin problem is persistent, resistant to the usual treatments, or has appeared alongside other changes, it is worth asking what it might be reporting.
Changes worth investigating
None of these mean something is wrong. Each is a reasonable prompt to test rather than to buy another product.
- Persistent adult acne along the jaw, particularly with irregular periods — worth a hormonal assessment
- Very dry, coarse skin with fatigue and feeling cold — worth checking thyroid function
- Darkened, velvety skin in the neck folds or underarms — associated with insulin resistance
- Unexplained itching without a rash — occasionally liver or thyroid related
- Slow-healing skin and recurrent infections — sometimes the first sign of raised blood glucose
Deficiencies that show on the skin
Iron deficiency contributes to hair shedding and brittle nails. Low vitamin D is associated with a range of skin complaints. B12 deficiency can cause pigmentation changes and mouth ulcers.
These are all measurable, and correcting them addresses the cause rather than the appearance.
When it is just skin
Plenty of skin problems are exactly what they look like — eczema, contact reactions to a new product, sun damage, the effects of hard water and air conditioning. Those need dermatological treatment, not a metabolic workup.
The judgement about which category you are in is what a consultation is for.
How it is assessed
A consultation looks at the skin, takes a history and — where the pattern suggests it — checks bloods: thyroid function, glucose or HbA1c, liver function, iron studies, vitamin D and hormones as appropriate.
Where the answer is dermatological, treatment goes down that route instead.
Common questions
Can skin problems indicate internal disease?
Sometimes. Thyroid disease, insulin resistance, liver conditions and nutritional deficiencies all have recognised skin signs. Most skin complaints are primarily dermatological, which is why assessment starts with a consultation rather than an assumption either way.
What tests are done for persistent skin problems?
Where the pattern suggests an internal cause, typically thyroid function, glucose or HbA1c, liver function, iron studies, vitamin D and hormone levels.
When should I see a doctor about my skin?
When a problem persists despite treatment, appears alongside other symptoms such as fatigue or cycle changes, or involves a mole that is changing or a lesion that will not heal.
This article is general health information, not medical advice, and does not replace a consultation. Care at Smart Care Polyclinic is provided by DHA-licensed clinicians.