Should I save leftover sun cream for next year’s holiday? Sun cream has a shelf life of two to three years, providing it hasn’t been opened and hasn’t been stored at high temperatures or in direct sunlight.

So, pop it into a cool bag or in the shade on the beach, and don’t leave it lying around in your car. Most lotions, creams and gels should also have a use-by date, and should never be used after this.

As the formula and filters weaken, which can mean less protection and potential damage to the skin.

Don’t keep sun protection products that have been opened for any longer than three months, as bacteria can also damage the cream’s filters – you can usually spot this when the cream begins to separate.

And, as an extra tip, keep sun protection and aftersun products in the fridge when you’re not using them, as they’ll last longer and will feel deliciously refreshing on the skin.

I have brown marks on my face and I have booked a microdermabrasion treatment at my local beauty salon, as I believe this will help to fade the marks. Since I also suffer from rosacea, will this treatment aggravate my skin?
It sounds like your brown marks are sunspots or lentigos, sometimes known as liver spots.
These are blemishes or brown spots on the skin associated with ageing and exposure to the ultra-violet radiation from the sun.
They range in colour from light brown to red or black and are located in area most often exposed to the sun, particularly the hands, face, shoulders, arms and forehead and the head if the person is bald.

Dr Elisabeth Dancey, a leading cosmetic doctor, suggests: 'As you are troubled with rosacea, I would suggest you have a less aggressive, more reliable form of treatment such as laser or IPL (Intense Pulsed Light, which is a non-laser light source).

'This will help the rosacea and its visible signs (dilated blood vessels, persistent redness, flushing, acne-like breakouts) and will improve the quality of the skin on the whole face.

'I strongly advise using a high sun protection factor of at least SPF 40 or more from now on, since the sun is the most likely cause of both your brown marks and your rosacea,' she advises.