The sunscreen you already own is worth checking before you buy another bottle. Start with its expiry date, storage history and how your skin responds.
An in-date product kept as directed needs a different decision from one left in a hot car. Repeated irritation needs advice from your GP or a neutral bay dermatologist. Keep the product label for that discussion.
Here are three situations that can leave a half-used bottle sitting around, and how to approach each one.
Bottle one: it has been sitting in a cool cupboard
Check this bottle before replacing it simply because another summer has arrived. Look at the container itself, rather than relying on when you remember buying it.
Work through these checks:
Read the expiry date. If it has passed, replace the product.
Read the storage instructions and consider where the bottle has actually been kept.
Check current Therapeutic Goods Administration recall advice for the exact product and any affected batches.
An unreadable date leaves a different problem. Check the carton if you still have it, or contact the manufacturer with the batch details. A purchase receipt tells you when you bought the bottle. It does not tell you the expiry date of that particular product.
A recall can involve unexpired stock. Keep the product name and batch number available so you can compare them accurately. Follow the instructions for the affected product, including any return arrangements.
The formulation also needs to provide appropriate protection. Cancer Council recommends broad-spectrum, water-resistant SPF50 or SPF50+ sunscreen, alongside clothing, a broad-brimmed hat, sunglasses and shade.
If the bottle remains suitable, use the amount directed on its label. Trying to stretch a small remainder by applying less defeats its purpose. Buy a replacement before you run short, rather than rationing the final few applications.
If you have two suitable bottles open, keep track of both expiry dates. Use the one expiring first, provided it remains suitable. There is little reason to open a third while those are waiting.
Bottle two: it has been living in the glovebox
Treat the storage history as part of the decision. A glovebox hides a bottle from direct sunlight, but it does not guarantee a cool temperature.
The printed expiry date assumes appropriate storage. Cancer Council advises checking the label’s conditions, with sunscreen typically stored below 30°C in a cool, dark place.
If the bottle has been exposed to excessive heat, do not rely on the date alone. Ask the manufacturer or a pharmacist about the exposure. If its suitability cannot be established, use a reliable replacement.
A normal appearance cannot answer every question
Separation, grittiness or lumps are reasons to question the product’s condition. Incorrect storage can affect the way sunscreen spreads and the protection it provides.
Do not assume that shaking a heat-damaged product restores its original performance. Follow any shaking directions on the label, but recognise that mixing and checking effectiveness are different things.
A patch test cannot check the SPF
Testing a suitable new product on a small area may help identify a skin reaction. It does not establish the UV protection of a bottle with an uncertain storage history.
Neither does waiting to see whether you burn. Choose dependable protection before going outside, rather than using sun exposure as an experiment.
The lesson from this bottle is practical: replacing it helps only if the next one gets a better storage spot.
Bottle three: you stopped using it after a rash
Set this one aside while you get advice. Having paid for it is not a reason to keep applying a product you suspect caused a reaction.
Keep the packaging long enough to identify what you used. Sunscreens contain several ingredients, and a reaction does not prove that every sunscreen will cause the same problem.
Fragrances, preservatives and UV-filter ingredients can all be relevant. A clinician can assess the history and discuss whether testing or a different formulation is appropriate.
Instead of ordering several alternatives at once, prepare three useful details:
Photograph the product name, ingredient list and batch number.
Note where the reaction appeared and when it started after application.
List other products used on the same area around that time.
This gives the consultation something specific to work with. Mention itching, stinging or other discomfort even if the visible rash has settled by the appointment.
For a product suspected of causing a reaction, discuss any further testing with your clinician first. Do not keep reapplying it at home to establish whether the reaction happens again.
While sorting out a tolerable sunscreen option, use protective clothing, a hat and shade to reduce exposure. Arrange advice about suitable sunscreen rather than abandoning sun protection altogether.
Give the next bottle a place to live
Before buying, decide where the product will be stored between uses. Check that the spot meets its label instructions throughout the day, not just when you first put it there.
Choose a quantity you can use as directed before expiry. A large promotional pack is less useful if several bottles sit unfinished beyond their dates.
Keep the original label readable, including the expiry and batch details. If you carry sunscreen on an outing, protect it from excessive heat and return it to appropriate storage afterwards.
Put the suitable bottle back into use. Keep the one needing professional advice clearly separate. Follow the relevant disposal or recall instructions for anything you can no longer use.
