In principle Herpes can leave scars but it is not very common.
There are several types of Herpes and the most common are

• Herpes Simplex 1: Causes Oral Herpes -
  cold sores
• Herpes Simplex 2: Causes Genital Herpes
• Herpes Zoster: Causes chickenpox and
  shingles

They all have symptoms that start with a rash that turns into
blisters which then turn into a dry scab. The Herpes Zoster
symptoms are often itchy or painful and if you scratch them
repeatedly and with force, you do risk scarring. To avoid
this you may take painkillers or use and anti itch or local
anesthetic cream.

The symptoms of Oral and Genital are usually not itchy or painful
but can be quite unattractive. You should have no reason
to scratch the scab and therefore it should leave no scars

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