Apples only affect some guinea pigs. These guinea pigs have a weakness in the membranes of their lips which can be damaged by the acid in apples, leaving the underlying tissue open to fungal or bacterial attack. The symptoms are hard dark scabs around the lips.
One of my three guinea pigs had this problem so if your guinea pigs have been eating apples and have shown none of the symptoms then apples are not a problem for them.
Symptoms occur quite quickly so if you have been feeding them apples for a while and nothing has happened, keep apples in their diet!
Mine get an apple about once a fortnight. Shared between 5 they just get a small portion and then they only get the red ones which dont seem to acidic.
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