While l’m sorry about your diagnosis, this isn’t cancer top trumps and your post is dismissive and rude. I’ve been recently treated for breast cancer and can attest, as you can, to the fact that a cancer diagnosis is terrifying.
My DH had BCC two years ago, and it was anything but a ‘nothing burger’ - it was found under a finger nail and had been there undetected until discovered by accident during treatment for an unrelated condition. It had spread, and resulted in him losing a finger and nearly his hand, after complications with the original amputation. And last time l looked they don’t ultrasound your lymph nodes checking for spread if you have ‘warts’.
There are two commonly used topical creams for skin cancer - one is an immunotherapy cream that stimulates your body's immune system to attack and destroy the cancer cells. The other is a chemotherapy cream used for more aggressive skin cancers to address rapidly dividing cancer cells - since OP has stated it’s a chemotherapy cream l think it’s likely that her mum has a form of the latter.
Even when siting in a consultants’ office, having the diagnosis explained to you, with reassurance of a treatment path and the opportunity to ask questions, being told you have cancer is a very frightening experience. I simply cannot imagine having tests and waiting for a diagnosis and then skipping straight being told you are being treated for cancer, without even the courtesy of a consultation to break the news, or explain the diagnosis and treatment, or to address the very real fears attached to the word itself. Someone has dropped the ball, and badly, and rather than being thrilled for an answer and treatment l would be wanting to know why l wasn’t afforded the normal protocols when dealing with a cancer diagnosis.