Melanoma in situ

I’ve always had flat ragged brown mole on my arm, with a few smaller ones around my neck (checked years ago, all ok).

Ive been in Norfolk, outside a lot, doing lots of manual work - tiling etc.

not aware of hurting myself but I am clumsy.

overnight woke up to a black mole.

went to drs few days later, 11x7mm and put on fast track.

dermatologist told me she wasn’t worried but would I like it removed. I said yes - she said 4-6 weeks. Photos taken. No mention of melanoma/cancer at all.

she sent letter on app pre photo results. Diagnosis melanoma in situ narrow 2mm excision.

i can’t tell from clinical notes what she thought except Mm? Noted (mm or melanoma?)

I read everywhere 5mm excision for melanoma in situ narrow  and 5mm for melanoma in situ.

why is mine 2mm? Why didn’t she mention any of this to me?

panicking. But I am neurotic and already stressing about pancreas ipmn. I’m going mad! 61 year old healthy(ish!) female