The Auckland dad-of-two was shocked in October last year to learn his growth likely was a melanoma.
"Skin cancer had never even crossed my mind," Grobler said. "Then I was kicking myself for not having it treated sooner. I would hardly describe myself as a sun-worshipper so I was stunned."
First stop was a pharmacy MoleMap, which confirmed melanoma.
The first attempt to remove the mole, in February this year, left the wound infected. He then had surgery at Auckland Hospital.
"I had a fairly large chunk cut out of my chest, in case the cancer had spread," Grobler, from Mt Wellington, explained. "Fortunately, we got it in time, otherwise I was looking at chemotherapy. It was very stressful for my family and it took a while for the severity of it to kick in. Emotionally, it was horrendous for all of us."
MoleMap dermatologist Dr Mark Gray said the cancer could rapidly spread once a mole became malignant, making it extremely hard to remove effectively.
Grobler was given the all-clear in April. He urged anyone who notices an unusual mole to seek treatment straight away.
"I would ask anyone not to wait like I did."
• Unusual sores, lumps, blemishes, markings or changes in the the skin.
• The first sign of a melanoma is often a change in an existing mole or freckle, or the appearance of a new mole or freckle. Consult a doctor.
• The most common site in men is on the back and for women is on the legs.