Brief Answer:
Need direct assessment,
melanoma unlikely
Detailed Answer:
Hi again
I have seen the attached pictures .
Going by the type of pigmentation that you have, I would think more on the lines of a post inflammatory
hyperpigmentation .Now this is a type of darkening of the skin which can develop secondary to any skin condition.
In the perianal region, such a pigmentation can develop secondary to any infective or allergic skin condition like after a candidal infection or it can even develop after an irritant reaction in the region.
It is sometimes possible that the condition is so mild that the person is not aware of it.
But still we would like to be very sure of the skin condition. For this , you will need to examined properly by a gynaecologist or a
dermatologist . Direct examination of the area and the surrounding region will help to some extent in confirmation of the diagnosis.
For the time being, the possibility of melanoma is very less according to me. Melanomas in the anorectal region are mostly skin colourless or non pigmented and present as raised masses , rather than as pigmented skin areas.
So I would advise you to see a local doctor soon for proper assessment.
As far as the features of
nausea and other symptoms are concerned, they look more associated with the
gastrointestinal infection that you have.
Dr Geetika Paul