This lemon fruit has lumps
Please provide us your location (country/region or State and county/city)
Thanks. This will help us assign the question to the appropriate specialist.
I live in Cordalba, Queensland, Australia
Hi there, while this pretty far out of my area, I think you are likely dealing with lemon scab, which is not attributed to an insect but a fungal pathogen. This literature states that the disease is common in coastal areas of Australia and when I searched for Cordalba, I saw that your location is coastal. Please see the links to these Australian Extension publications. They give tips for diagnosis and management.