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Itching
Persistent itching, with or without a visible rash: what causes it and when it should be assessed.
Itching is not a diagnosis: it is a symptom, and one of the least specific there is. It can accompany dermatitis, very dry skin, a reaction to a product, a bite, an infection, and in some cases it can appear with nothing visible on the skin at all. Treating it as a problem in its own right — applying creams until it passes — works while the cause is trivial, and stops working precisely when it matters most.
The first useful distinction is between itching accompanied by a visible rash and itching that appears on apparently normal skin. In the first case the appearance and distribution of the lesions already guide the diagnosis: where they are, what shape they take, whether they follow the flexures, the sebaceous areas, or areas in contact with something. In the second the skin offers fewer clues, and assessment serves precisely to establish whether the origin is cutaneous or should be sought elsewhere.
There is then an aspect patients experience directly and are seldom told about: itching tends to feed itself. Scratching brings immediate but brief relief, and repeated rubbing damages the skin barrier, which in turn becomes more reactive. In long-standing cases the skin can thicken exactly where it has been scratched most. Breaking that cycle is therefore part of the treatment, not a side note.
It is worth having itching assessed when it has lasted for weeks, when it disturbs sleep, when it is spread over the whole body, when it appears with nothing visible on the skin, or when it does not respond to the measures that usually suffice. In those cases the aim of the visit is not to relieve the symptom for a few days, but to understand what is producing it.
When there is nothing to see
Itching on skin that looks normal is the one most often postponed, precisely because there is nothing to see and it seems minor. It is in fact the situation where assessment matters most: with no lesions to examine, the diagnosis is built on the clinical history — how long it has lasted, how it began, whether it is localised or generalised, what makes it worse, which medicines and products are being used — and that reconstruction is exactly what is missing when someone tries to solve it alone.
How it shows
- Itching limited to one area or spread over the whole body
- Worsening in the evening or at night, with disturbed sleep
- Presence or absence of a visible rash: these are two different pictures
- Dry, tight, flaking skin
- Scratch lesions, excoriations and crusts
- In prolonged cases, thickened skin where scratching has persisted
How we proceed
- 1Dermatological visit: how long the itching has lasted, how it began, what makes it worse
- 2Skin examination: presence, appearance and distribution of any lesions
- 3Review of products, medicines and exposures when a contact cause is suspected
- 4Patch testing or further investigation when clinical suspicion justifies it (patch testing at the Siena practice)
- 5Treatment targeted at the identified cause, together with measures to break the itch-scratch cycle
Available treatments
- Dermatology visit
- Identification of the cause
- Treatment targeted at the cause
- Patch testing (Siena practice)
- Management of the itch-scratch cycle
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Frequently asked questions
Why does itching get worse in the evening?+
Almost everyone notices this. Several factors contribute: skin temperature and blood flow to the skin change over the course of the day, and in the evening the distractions that shift attention elsewhere during the day fall away. The result is that the same stimulus is perceived as more intense, and sleep suffers.
I have itching but nothing is visible on my skin: should I worry?+
It is not a cause for alarm, but it is the situation where assessment makes most sense, rather than continuing by trial and error. When there are no lesions to examine, the diagnosis is built on the clinical history: how long it has lasted, whether it is localised or generalised, what triggers it, which medicines and products are being used. The point is to establish whether the origin is cutaneous or should be sought elsewhere.
Does scratching really make it worse?+
Yes, and it is not a matter of willpower. Scratching relieves for a few seconds, but repeated rubbing causes micro-trauma to an already vulnerable barrier: the resulting inflammation can reignite the itch, and in chronic cases the skin can thicken exactly where scratching has persisted. Breaking the cycle is part of the treatment.
Are moisturisers enough?+
When itching depends solely on dry skin, adequate hydration can be enough, and it remains useful as a baseline measure in almost all cases. It is not enough, however, when there is underlying inflammation, a contact reaction or another specific cause: there a moisturiser relieves without acting on the mechanism, and the itching returns as soon as it is stopped.
When is it worth booking a visit?+
When itching has lasted for weeks, when it disturbs sleep, when it is spread over the whole body, when it appears with nothing visible on the skin, or when it does not respond to the measures that usually suffice. In those cases the aim is not to relieve the symptom for a few days, but to identify the cause producing it.
Related reading
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