Without seeing the fruit it is hard to confirm if this is a fungal problem (but very unlikely to be cancer). We think it is damage of the Guava moth fruit fly (if you are Hamilton North). Is the dot a possible entry/exit point? At this time of the year we would recommend spraying with Enspray Oil and Free Flow Copper spray both are certified organic sprays and will control/prevent any insect or fungal problems. If it is Guava moth you will need to use guava moth traps from October onwards.
Thanks, the Palmers team
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