We need to know the reason for the qualitative change of hand cream. Usually hand cream contains a certain proportion of water, which may evaporate during long-term storage, resulting in an increase in product concentration. Bacteria in the air may also enter the product through the opening, leading to deterioration. Therefore, when we feel that the taste of hand cream has changed obviously, it is probably caused by bacterial pollution.
Then back to the question itself, if the taste of hand cream turns sour, can I continue to use it? According to professional advice and personal experience, it can still be used to some extent if there is no uncomfortable reaction and no obvious change in color or texture during use.
I strongly suggest that you carefully observe the change degree of hand cream. If the taste is only slightly sour or not obvious, you can try it in a small area first to see if there is any skin discomfort. If there is no allergic or stinging problem, then you can continue to use it. However, if the taste becomes sour or unpleasant, and the skin becomes allergic and red after use, stop using it immediately.
In order to avoid the expiration of hand cream, we also need to pay attention to the correct storage. The hand cream should be kept in a dry, cool and dark place to avoid sunlight or high temperature. Please make sure your hands are clean before use, and take the product with a clean spoon to reduce the chance of bacterial contamination.
To sum up, we can say that if the hand cream has a sour taste, you can try it in a small area to see if there is any discomfort. However, if the taste is obviously sour or unpleasant, and the skin is allergic and red after use, then stop using it immediately. In order to avoid the deterioration of hand cream, we also need to pay attention to the correct storage and hygiene measures before use. I hope this information can help you, and I wish you healthy and smooth hands!