Hello and thank you for your post.

Most skin pigmentation and moles/lesions in the vulva area are easily explained.

Vulva cancer is rare, and tends to affect older women over 65. If you are concerned, then do make an Appointment to see your GP who will examine you and hopefully reassure you. You can ask for a female GP. It is usually best to get things checked out for peace of mind. Try to not Google symptoms, as it rarely helps. 

I hope that this helps, 

Wishing you the best, 

Vanda