Definitely you should visit dermatologist
It seems that you are having pruritus
There are many causes.
In your case haemorrhoids may be the cause.
Thorough examination will be done and if needed he will advise for blood test
to rule out other diseases.
Antihistaminics , mild steroid
with antibacterial cream may be prescribed.
If there is hamorrhoides, he will refer to surgeon.
I hope you got my answer.
Dr. Ilyas Patel MD