If your skin has suddenly become reactive, uncomfortable, or difficult to manage, you are not alone. Many people, particularly those going through cancer treatment, notice unexpected changes in how their skin behaves. Understanding why this happens is the first and most reassuring step towards managing it.

What is Sensitive Skin?

Sensitive skin is not a medical diagnosis in itself. It is a way of describing skin that reacts more intensely than normal to everyday triggers, whether that is a change in temperature, a new product, or simply the environment around you.

At the heart of most sensitive skin is the same underlying issue: the skin’s outer protective layer, the skin barrier, is not working as effectively as it should. When this barrier is weakened, irritants and allergens can enter the skin more easily, moisture escapes more quickly, and nerve endings beneath the surface become more reactive.

The result is skin that feels easily irritated, and this can manifest as redness, stinging, burning, dryness, or itching in response to things that would not normally cause a reaction.

Why Does it Happen?

Sensitive skin can develop for many reasons, and more than one factor is often involved at the same time:

A weakened skin barrier: This is the most frequent underlying cause. When the lipid layer holding skin cells together is disrupted, the skin loses moisture and becomes permeable to irritants.

Cancer treatment: Chemotherapy and radiation therapy are among the most significant triggers of sudden skin sensitivity. They can strip the skin of its protective oils, disrupt the barrier, and increase vulnerability to infection and irritation. Many patients who had no skin concerns before treatment find that their skin behaves very differently once treatment begins.

Inflammatory skin conditions: Eczema, rosacea, psoriasis, and contact dermatitis all involve a degree of chronic barrier dysfunction that makes skin more reactive.

Skincare products: Fragrances, alcohol, sulphates, and certain preservatives are among the most common product-related triggers. Many people do not realise that products they have used for years may become problematic when their skin barrier is under stress.

Environmental factors: Cold wind, low humidity, UV exposure, and air conditioning can all reduce moisture and place additional strain on the barrier.

Hormonal changes: Fluctuations in oestrogen and progesterone during menstruation, pregnancy, menopause, or hormone therapy can alter skin sensitivity significantly.

Age: As skin ages, sebum production naturally decreases, and the barrier becomes less efficient, which is why skin tends to become more reactive with time.

Nutritional factors: Low levels of essential fatty acids, vitamins C, D, and E, and zinc can impair the skin’s ability to maintain its natural defences.

What Can You Do?

The good news is that sensitive skin is very manageable with the right approach. The goal is to remove anything that is stressing the barrier and give it what it needs to recover.

A Note On Cancer Treatment

If you are currently undergoing chemotherapy or radiation therapy, it is important to know that skin sensitivity during treatment is not a sign that something has gone wrong. It is a well-documented side effect that many patients experience, and it can often be managed effectively with the right supportive care.

Products developed specifically for compromised skin, such as those in the CanScience range, are formulated without the fragrances, alcohols, and irritants most likely to cause reactions during treatment. Always discuss any new skincare product with your oncology team before using it.